Other: Release Bridge HZM 1.6.6

GODT-1029: Fix tray icon not updating under certain conditions
GODT-1062: Fix lost notification bar when window is closed
2021-02-25 16:28:17 +01:00 · 2021-02-25 14:53:43 +00:00 · 2021-02-25 14:53:43 +00:00 · 2021-02-25 14:47:12 +00:00 · 2021-02-24 19:32:59 +00:00 · 2021-02-24 20:34:13 +01:00
102 changed files with 1484 additions and 610 deletions
--- a/.gitignore
+++ b/.gitignore
@ -26,6 +26,9 @@ internal/frontend/qml/ProtonUI/images
 internal/frontend/qml/ImportExportUI/images
 frontend/qml/*.qmlc

+# Credits files (generated).
+internal/**/credits.go
+
 # Build files
 /launcher-*
 /bridge_*_*.tgz
--- a/Changelog.md
+++ b/Changelog.md
@ -2,6 +2,56 @@

 Changelog [format](http://keepachangelog.com/en/1.0.0/)

+## [Bridge 1.6.6] HZM
+
+### Added
+* Other: QA build checks for update every 5 minutes.
+* Other: QA build adds debug message dump when sending.
+
+### Changed
+* GODT-1045 build without Qt by default.
+
+### Fixed
+* GODT-1029 Fix tray icon not updating under certain conditions.
+* GODT-1062 Fix lost notification bar when window is closed.
+* GODT-1058 Install version after chaning channel right away only in case of downgrade.
+* GODT-1073 Re-write autostart link on every start if turned on in preferences.
+* GODT-1055 Fix flaky empty trash test.
+
+
+## [Bridge 1.6.5] HZM
+
+### Changed
+* GODT-1059 Check if keychain is usable on linux before using it by default.
+
+
+## [Bridge 1.6.4] HZM
+
+### Added
+* Other: Autoupdates CLI commands.
+
+### Removed
+* Other: Remove credits.
+
+### Changed
+* GODT-980 Placeholder for user agent.
+* GODT-1036 Event loop Sentry reporting of failures and refresh.
+* GODT-957 Increase space to hide difference.
+* GODT-937 Add keychain switcher to frontend.
+* GODT-1008 Fix transparent dialog under certain conditions.
+* GODT-1034 More tolerant connection speed detection.
+* GODT-1018 Pre-push git hook to check lints.
+* Other: Make all command line flags as const strings.
+* GODT-1041 Log IMAP requests to debug Apple Mail re-sync issue.
+* Other: Pretty print prefs.json.
+
+### Fixed
+* Other: Fix nogui build.
+* GODT-317 Fix wrong total mailbox size in Apple Mail.
+* Other: Fixing changelog punctuation.
+* GODT-797 APPEND waits for EXPUNGE to prevent data loss when Outlook moves from Spam or Trash.
+
+
 ## [Bridge 1.6.3] HZM

 ### Added
@ -10,15 +60,15 @@ Changelog [format](http://keepachangelog.com/en/1.0.0/)
 ### Changed
 * GODT-885 Do not explicitly unlabel folders during move to match behaviour of other clients.
 * GODT-616 Better user message about wrong mailbox password.
-* GODT-1021 Do not allow copy Inbox->Sent or Sent->Inbox
-* GODT-976 Exclude updates from clearing cache and clear cache, including updates, while switching early access off
-* GODT-1033 Retry starting IMAP server after connection was down
+* GODT-1021 Do not allow copy Inbox->Sent or Sent->Inbox.
+* GODT-976 Exclude updates from clearing cache and clear cache, including updates, while switching early access off.
+* GODT-1033 Retry starting IMAP server after connection was down.

 ### Fixed
 * GODT-1011 Stable integration test deleting many messages using UID EXPUNGE.
 * GODT-1015 Use lenient version parser to properly parse version provided by Mac.
 * GODT-919 Notify about update right after the start.
-* GODT-919 GODT-1022 Logs and signals
+* GODT-919 GODT-1022 Logs and signals.


 ## [IE 1.3.0] Farg
--- a/26
+++ b/26
@ -10,7 +10,7 @@ TARGET_OS?=${GOOS}
 .PHONY: build build-ie build-nogui build-ie-nogui build-launcher build-launcher-ie  versioner hasher

 # Keep version hardcoded so app build works also without Git repository.
-BRIDGE_APP_VERSION?=1.6.3+git
+BRIDGE_APP_VERSION?=1.6.6+git
 IE_APP_VERSION?=1.3.0+git
 APP_VERSION:=${BRIDGE_APP_VERSION}
 SRC_ICO:=logo.ico
@ -33,7 +33,7 @@ BUILD_TIME:=$(shell date +%FT%T%z)

 BUILD_FLAGS:=-tags='${BUILD_TAGS}'
 BUILD_FLAGS_LAUNCHER:=${BUILD_FLAGS}
-BUILD_FLAGS_NOGUI:=-tags='${BUILD_TAGS} nogui'
+BUILD_FLAGS_GUI:=-tags='${BUILD_TAGS} build_qt'
 GO_LDFLAGS:=$(addprefix -X github.com/ProtonMail/proton-bridge/internal/constants.,Version=${APP_VERSION} Revision=${REVISION} BuildTime=${BUILD_TIME})
 ifneq "${BUILD_LDFLAGS}" ""
    GO_LDFLAGS+=${BUILD_LDFLAGS}
@ -45,7 +45,7 @@ ifeq "${TARGET_OS}" "windows"
 endif

 BUILD_FLAGS+=-ldflags '${GO_LDFLAGS}'
-BUILD_FLAGS_NOGUI+=-ldflags '${GO_LDFLAGS}'
+BUILD_FLAGS_GUI+=-ldflags '${GO_LDFLAGS}'
 BUILD_FLAGS_LAUNCHER+=-ldflags '${GO_LDFLAGS_LAUNCHER}'

 DEPLOY_DIR:=cmd/${TARGET_CMD}/deploy
@ -83,8 +83,8 @@ build: ${TGZ_TARGET}
 build-ie:
 	TARGET_CMD=Import-Export $(MAKE) build

-build-nogui:
-	go build ${BUILD_FLAGS_NOGUI} -o ${EXE_NAME} cmd/${TARGET_CMD}/main.go
+build-nogui: gofiles
+	go build ${BUILD_FLAGS} -o ${EXE_NAME} cmd/${TARGET_CMD}/main.go

 build-ie-nogui:
 	TARGET_CMD=Import-Export $(MAKE) build-nogui
@ -137,7 +137,7 @@ endif
 ${EXE_TARGET}: check-has-go gofiles ${ICO_FILES} ${VENDOR_TARGET}
 	rm -rf deploy ${TARGET_OS} ${DEPLOY_DIR}
 	cp cmd/${TARGET_CMD}/main.go .
-	qtdeploy ${BUILD_FLAGS} ${QT_BUILD_TARGET}
+	qtdeploy ${BUILD_FLAGS_GUI} ${QT_BUILD_TARGET}
 	mv deploy cmd/${TARGET_CMD}
 	if [ "${EXE_QT_TARGET}" != "${EXE_TARGET}" ]; then mv ${EXE_QT_TARGET} ${EXE_TARGET}; fi
 	rm -rf ${TARGET_OS} main.go
@ -180,7 +180,7 @@ update-qt-docs:
 	go get github.com/therecipe/qt/internal/binding/files/docs/$(QT_API)

 ## Dev dependencies
-.PHONY: install-devel-tools install-linter install-go-mod-outdated
+.PHONY: install-devel-tools install-linter install-go-mod-outdated install-git-hooks
 LINTVER:="v1.29.0"
 LINTSRC:="https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh"

@ -197,6 +197,9 @@ install-linter: check-has-go
 install-go-mod-outdated:
 	which go-mod-outdated || go get -u github.com/psampaz/go-mod-outdated

+install-git-hooks:
+	cp utils/githooks/* .git/hooks/
+	chmod +x .git/hooks/*

 ## Checks, mocks and docs
 .PHONY: check-has-go add-license change-copyright-year test bench coverage mocks lint-license lint-golang lint updates doc release-notes
@ -249,14 +252,13 @@ mocks:
 	mockgen --package mocks github.com/ProtonMail/proton-bridge/pkg/listener Listener > internal/store/mocks/utils_mocks.go
 	mockgen --package mocks github.com/ProtonMail/proton-bridge/pkg/pmapi Client > pkg/pmapi/mocks/mocks.go

-lint: lint-golang lint-license lint-changelog
+lint: gofiles lint-golang lint-license lint-changelog

 lint-license:
 	./utils/missing_license.sh check

 lint-changelog:
 	./utils/changelog_linter.sh Changelog.md
-	./utils/changelog_linter.sh unreleased.md

 lint-golang:
 	which golangci-lint || $(MAKE) install-linter
@ -301,12 +303,12 @@ run-qt-cli: ${EXE_TARGET}
 	PROTONMAIL_ENV=dev ./$< ${RUN_FLAGS} -c

 run-nogui: clean-vendor gofiles
-	PROTONMAIL_ENV=dev go run ${BUILD_FLAGS_NOGUI} cmd/${TARGET_CMD}/main.go ${RUN_FLAGS} | tee last.log
+	PROTONMAIL_ENV=dev go run ${BUILD_FLAGS} cmd/${TARGET_CMD}/main.go ${RUN_FLAGS} | tee last.log
 run-nogui-cli: clean-vendor gofiles
-	PROTONMAIL_ENV=dev go run ${BUILD_FLAGS_NOGUI} cmd/${TARGET_CMD}/main.go ${RUN_FLAGS} -c
+	PROTONMAIL_ENV=dev go run ${BUILD_FLAGS} cmd/${TARGET_CMD}/main.go ${RUN_FLAGS} -c

 run-debug:
-	PROTONMAIL_ENV=dev dlv debug --build-flags "${BUILD_FLAGS_NOGUI}" cmd/${TARGET_CMD}/main.go -- ${RUN_FLAGS}
+	PROTONMAIL_ENV=dev dlv debug --build-flags "${BUILD_FLAGS}" cmd/${TARGET_CMD}/main.go -- ${RUN_FLAGS}

 run-qml-preview:
 	$(MAKE) -C internal/frontend/qt -f Makefile.local qmlpreview
--- a/cmd/launcher/main.go
+++ b/cmd/launcher/main.go
@ -25,13 +25,14 @@ import (
 	"runtime"

 	"github.com/ProtonMail/gopenpgp/v2/crypto"
+	"github.com/ProtonMail/proton-bridge/internal/config/useragent"
 	"github.com/ProtonMail/proton-bridge/internal/constants"
 	"github.com/ProtonMail/proton-bridge/internal/crash"
 	"github.com/ProtonMail/proton-bridge/internal/locations"
 	"github.com/ProtonMail/proton-bridge/internal/logging"
+	"github.com/ProtonMail/proton-bridge/internal/sentry"
 	"github.com/ProtonMail/proton-bridge/internal/updater"
 	"github.com/ProtonMail/proton-bridge/internal/versioner"
-	"github.com/ProtonMail/proton-bridge/pkg/sentry"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 )
@ -44,7 +45,7 @@ var (
 )

 func main() { // nolint[funlen]
-	reporter := sentry.NewReporter(appName, constants.Version)
+	reporter := sentry.NewReporter(appName, constants.Version, useragent.New())

 	crashHandler := crash.NewHandler(reporter.ReportException)
 	defer crashHandler.HandlePanic()
--- a/go.mod
+++ b/go.mod
@ -6,7 +6,7 @@ go 1.13
 // They are in a separate require block to highlight this.
 require (
 	github.com/docker/docker-credential-helpers v0.6.3
-	github.com/emersion/go-imap v1.0.6-0.20200708083111-011063d6c9df
+	github.com/emersion/go-imap v1.0.6
 	github.com/jameskeane/bcrypt v0.0.0-20170924085257-7509ea014998
 	golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9
 )
@ -29,7 +29,7 @@ require (
 	github.com/emersion/go-imap-appendlimit v0.0.0-20190308131241-25671c986a6a
 	github.com/emersion/go-imap-idle v0.0.0-20200601154248-f05f54664cc4
 	github.com/emersion/go-imap-move v0.0.0-20190710073258-6e5a51a5b342
-	github.com/emersion/go-imap-quota v0.0.0-20200423100218-dcfd1b7d2b41
+	github.com/emersion/go-imap-quota v0.0.0-20210203125329-619074823f3c
 	github.com/emersion/go-imap-unselect v0.0.0-20171113212723-b985794e5f26
 	github.com/emersion/go-mbox v1.0.2
 	github.com/emersion/go-message v0.12.1-0.20201221184100-40c3f864532b
@ -54,6 +54,7 @@ require (
 	github.com/nsf/jsondiff v0.0.0-20200515183724-f29ed568f4ce
 	github.com/olekukonko/tablewriter v0.0.4 // indirect
 	github.com/pkg/errors v0.9.1
+	github.com/pkg/math v0.0.0-20141027224758-f2ed9e40e245
 	github.com/sirupsen/logrus v1.7.0
 	github.com/skratchdot/open-golang v0.0.0-20200116055534-eef842397966
 	github.com/ssor/bom v0.0.0-20170718123548-6386211fdfcf // indirect
--- a/go.sum
+++ b/go.sum
@ -77,8 +77,8 @@ github.com/emersion/go-imap-idle v0.0.0-20200601154248-f05f54664cc4 h1:/JIALzmCd
 github.com/emersion/go-imap-idle v0.0.0-20200601154248-f05f54664cc4/go.mod h1:o14zPKCmEH5WC1vU5SdPoZGgNvQx7zzKSnxPQlobo78=
 github.com/emersion/go-imap-move v0.0.0-20190710073258-6e5a51a5b342 h1:5p1t3e1PomYgLWwEwhwEU5kVBwcyAcVrOpexv8AeZx0=
 github.com/emersion/go-imap-move v0.0.0-20190710073258-6e5a51a5b342/go.mod h1:QuMaZcKFDVI0yCrnAbPLfbwllz1wtOrZH8/vZ5yzp4w=
-github.com/emersion/go-imap-quota v0.0.0-20200423100218-dcfd1b7d2b41 h1:z5lDGnSURauBEDdNLj3o0+HogVYKQCGeY3Anl/xyRfU=
-github.com/emersion/go-imap-quota v0.0.0-20200423100218-dcfd1b7d2b41/go.mod h1:iApyhIQBiU4XFyr+3kdJyyGqle82TbQyuP2o+OZHrV0=
+github.com/emersion/go-imap-quota v0.0.0-20210203125329-619074823f3c h1:khcEdu1yFiZjBgi7gGnQiLhpSgghJ0YTnKD0l4EUqqc=
+github.com/emersion/go-imap-quota v0.0.0-20210203125329-619074823f3c/go.mod h1:iApyhIQBiU4XFyr+3kdJyyGqle82TbQyuP2o+OZHrV0=
 github.com/emersion/go-imap-unselect v0.0.0-20171113212723-b985794e5f26 h1:FiSb8+XBQQSkcX3ubr+1tAtlRJBYaFmRZqOAweZ9Wy8=
 github.com/emersion/go-imap-unselect v0.0.0-20171113212723-b985794e5f26/go.mod h1:+gnnZx3Mg3MnCzZrv0eZdp5puxXQUgGT/6N6L7ShKfM=
 github.com/emersion/go-mbox v1.0.2 h1:tE/rT+lEugK9y0myEymCCHnwlZN04hlXPrbKkxRBA5I=
@ -223,6 +223,8 @@ github.com/pingcap/errors v0.11.4/go.mod h1:Oi8TUi2kEtXXLMJk9l1cGmz20kV3TaQ0usTw
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pkg/math v0.0.0-20141027224758-f2ed9e40e245 h1:gk/AF9SGRj+RafNCoDcS3RRscb8S4BVbvqODOgWA7/8=
+github.com/pkg/math v0.0.0-20141027224758-f2ed9e40e245/go.mod h1:2dhPPj2Li3DXrSY2U2ADdZy2B7sjQsT57lqENx1+FSE=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/russross/blackfriday v1.5.2 h1:HyvC0ARfnZBqnXwABFeSZHpKvJHJJfPz81GNueLj0oo=
--- a/internal/app/base/base.go
+++ b/internal/app/base/base.go
@ -43,25 +43,41 @@ import (
 	"github.com/ProtonMail/proton-bridge/internal/config/cache"
 	"github.com/ProtonMail/proton-bridge/internal/config/settings"
 	"github.com/ProtonMail/proton-bridge/internal/config/tls"
+	"github.com/ProtonMail/proton-bridge/internal/config/useragent"
 	"github.com/ProtonMail/proton-bridge/internal/constants"
 	"github.com/ProtonMail/proton-bridge/internal/cookies"
 	"github.com/ProtonMail/proton-bridge/internal/crash"
 	"github.com/ProtonMail/proton-bridge/internal/events"
 	"github.com/ProtonMail/proton-bridge/internal/locations"
 	"github.com/ProtonMail/proton-bridge/internal/logging"
+	"github.com/ProtonMail/proton-bridge/internal/sentry"
 	"github.com/ProtonMail/proton-bridge/internal/updater"
 	"github.com/ProtonMail/proton-bridge/internal/users/credentials"
 	"github.com/ProtonMail/proton-bridge/internal/versioner"
 	"github.com/ProtonMail/proton-bridge/pkg/keychain"
 	"github.com/ProtonMail/proton-bridge/pkg/listener"
 	"github.com/ProtonMail/proton-bridge/pkg/pmapi"
-	"github.com/ProtonMail/proton-bridge/pkg/sentry"
 	"github.com/allan-simon/go-singleinstance"
 	"github.com/sirupsen/logrus"
 	"github.com/urfave/cli/v2"
 )

+const (
+	flagCPUProfile      = "cpu-prof"
+	flagCPUProfileShort = "p"
+	flagMemProfile      = "mem-prof"
+	flagMemProfileShort = "m"
+	flagLogLevel        = "log-level"
+	flagLogLevelShort   = "l"
+	// FlagCLI indicate to start with command line interface
+	FlagCLI      = "cli"
+	flagCLIShort = "c"
+	flagRestart  = "restart"
+	flagLauncher = "launcher"
+)
+
 type Base struct {
+	SentryReporter *sentry.Reporter
 	CrashHandler   *crash.Handler
 	Locations      *locations.Locations
 	Settings       *settings.Settings
@ -71,6 +87,7 @@ type Base struct {
 	Creds          *credentials.Store
 	CM             *pmapi.ClientManager
 	CookieJar      *cookies.Jar
+	UserAgent      *useragent.UserAgent
 	Updater        *updater.Updater
 	Versioner      *versioner.Versioner
 	TLS            *tls.TLS
@ -92,7 +109,10 @@ func New( // nolint[funlen]
 	keychainName,
 	cacheVersion string,
 ) (*Base, error) {
-	sentryReporter := sentry.NewReporter(appName, constants.Version)
+	userAgent := useragent.New()
+
+	sentryReporter := sentry.NewReporter(appName, constants.Version, userAgent)
+
 	crashHandler := crash.NewHandler(
 		sentryReporter.ReportException,
 		crash.ShowErrorNotification(appName),
@ -166,20 +186,9 @@ func New( // nolint[funlen]
 		return nil, err
 	}

-	apiConfig := pmapi.GetAPIConfig(configName, constants.Version)
-	apiConfig.ConnectionOffHandler = func() {
-		listener.Emit(events.InternetOffEvent, "")
-	}
-	apiConfig.ConnectionOnHandler = func() {
-		listener.Emit(events.InternetOnEvent, "")
-	}
-	apiConfig.UpgradeApplicationHandler = func() {
-		listener.Emit(events.UpgradeApplicationEvent, "")
-	}
-	cm := pmapi.NewClientManager(apiConfig)
+	cm := pmapi.NewClientManager(getAPIConfig(configName, listener), userAgent)
 	cm.SetRoundTripper(pmapi.GetRoundTripper(cm, listener))
 	cm.SetCookieJar(jar)
-	sentryReporter.SetUserAgentProvider(cm)

 	key, err := crypto.NewKeyFromArmored(updater.DefaultPublicKey)
 	if err != nil {
@ -220,6 +229,7 @@ func New( // nolint[funlen]
 	}

 	return &Base{
+		SentryReporter: sentryReporter,
 		CrashHandler:   crashHandler,
 		Locations:      locations,
 		Settings:       settingsObj,
@ -229,6 +239,7 @@ func New( // nolint[funlen]
 		Creds:          credentials.NewStore(kc),
 		CM:             cm,
 		CookieJar:      jar,
+		UserAgent:      userAgent,
 		Updater:        updater,
 		Versioner:      versioner,
 		TLS:            tls.New(settingsPath),
@ -252,32 +263,32 @@ func (b *Base) NewApp(action func(*Base, *cli.Context) error) *cli.App {
 	app.Action = b.run(action)
 	app.Flags = []cli.Flag{
 		&cli.BoolFlag{
-			Name:    "cpu-prof",
-			Aliases: []string{"p"},
+			Name:    flagCPUProfile,
+			Aliases: []string{flagCPUProfileShort},
 			Usage:   "Generate CPU profile",
 		},
 		&cli.BoolFlag{
-			Name:    "mem-prof",
-			Aliases: []string{"m"},
+			Name:    flagMemProfile,
+			Aliases: []string{flagMemProfileShort},
 			Usage:   "Generate memory profile",
 		},
 		&cli.StringFlag{
-			Name:    "log-level",
-			Aliases: []string{"l"},
+			Name:    flagLogLevel,
+			Aliases: []string{flagLogLevelShort},
 			Usage:   "Set the log level (one of panic, fatal, error, warn, info, debug)",
 		},
 		&cli.BoolFlag{
-			Name:    "cli",
-			Aliases: []string{"c"},
+			Name:    FlagCLI,
+			Aliases: []string{flagCLIShort},
 			Usage:   "Use command line interface",
 		},
 		&cli.StringFlag{
-			Name:   "restart",
+			Name:   flagRestart,
 			Usage:  "The number of times the application has already restarted",
 			Hidden: true,
 		},
 		&cli.StringFlag{
-			Name:   "launcher",
+			Name:   flagLauncher,
 			Usage:  "The launcher to use to restart the application",
 			Hidden: true,
 		},
@ -302,21 +313,21 @@ func (b *Base) run(appMainLoop func(*Base, *cli.Context) error) cli.ActionFunc {
 		defer func() { _ = b.Lock.Close() }()

 		// If launcher was used to start the app, use that for restart/autostart.
-		if launcher := c.String("launcher"); launcher != "" {
+		if launcher := c.String(flagLauncher); launcher != "" {
 			b.Autostart.Exec = []string{launcher}
 			b.command = launcher
 		}

-		if doCPUProfile := c.Bool("cpu-prof"); doCPUProfile {
+		if c.Bool(flagCPUProfile) {
 			startCPUProfile()
 			defer pprof.StopCPUProfile()
 		}

-		if doMemoryProfile := c.Bool("mem-prof"); doMemoryProfile {
+		if c.Bool(flagMemProfile) {
 			defer makeMemoryProfile()
 		}

-		logging.SetLevel(c.String("log-level"))
+		logging.SetLevel(c.String(flagLogLevel))

 		logrus.
 			WithField("appName", b.Name).
@ -328,7 +339,7 @@ func (b *Base) run(appMainLoop func(*Base, *cli.Context) error) cli.ActionFunc {
 			Info("Run app")

 		b.CrashHandler.AddRecoveryAction(func(interface{}) error {
-			if c.Int("restart") > maxAllowedRestarts {
+			if c.Int(flagRestart) > maxAllowedRestarts {
 				logrus.
 					WithField("restart", c.Int("restart")).
 					Warn("Not restarting, already restarted too many times")
@ -364,3 +375,13 @@ func (b *Base) doTeardown() error {

 	return nil
 }
+
+func getAPIConfig(configName string, listener listener.Listener) *pmapi.ClientConfig {
+	apiConfig := pmapi.GetAPIConfig(configName, constants.Version)
+
+	apiConfig.ConnectionOffHandler = func() { listener.Emit(events.InternetOffEvent, "") }
+	apiConfig.ConnectionOnHandler = func() { listener.Emit(events.InternetOnEvent, "") }
+	apiConfig.UpgradeApplicationHandler = func() { listener.Emit(events.UpgradeApplicationEvent, "") }
+
+	return apiConfig
+}
--- a/internal/app/bridge/bridge.go
+++ b/internal/app/bridge/bridge.go
@ -38,21 +38,28 @@ import (
 	"github.com/urfave/cli/v2"
 )

+const (
+	flagLogIMAP        = "log-imap"
+	flagLogSMTP        = "log-smtp"
+	flagNoWindow       = "no-window"
+	flagNonInteractive = "noninteractive"
+)
+
 func New(base *base.Base) *cli.App {
 	app := base.NewApp(run)

 	app.Flags = append(app.Flags, []cli.Flag{
 		&cli.StringFlag{
-			Name:  "log-imap",
+			Name:  flagLogIMAP,
 			Usage: "Enable logging of IMAP communications (all|client|server) (may contain decrypted data!)"},
 		&cli.BoolFlag{
-			Name:  "log-smtp",
+			Name:  flagLogSMTP,
 			Usage: "Enable logging of SMTP communications (may contain decrypted data!)"},
 		&cli.BoolFlag{
-			Name:  "no-window",
+			Name:  flagNoWindow,
 			Usage: "Don't show window after start"},
 		&cli.BoolFlag{
-			Name:  "noninteractive",
+			Name:  flagNonInteractive,
 			Usage: "Start Bridge entirely noninteractively"},
 	}...)

@ -64,8 +71,7 @@ func run(b *base.Base, c *cli.Context) error { // nolint[funlen]
 	if err != nil {
 		logrus.WithError(err).Fatal("Failed to load TLS config")
 	}
-
-	bridge := bridge.New(b.Locations, b.Cache, b.Settings, b.CrashHandler, b.Listener, b.CM, b.Creds, b.Updater, b.Versioner)
+	bridge := bridge.New(b.Locations, b.Cache, b.Settings, b.SentryReporter, b.CrashHandler, b.Listener, b.CM, b.Creds, b.Updater, b.Versioner)
 	imapBackend := imap.NewIMAPBackend(b.CrashHandler, b.Listener, b.Cache, bridge)
 	smtpBackend := smtp.NewSMTPBackend(b.CrashHandler, b.Listener, b.Settings, bridge)

@ -79,9 +85,9 @@ func run(b *base.Base, c *cli.Context) error { // nolint[funlen]
 		imapPort := b.Settings.GetInt(settings.IMAPPortKey)
 		imap.NewIMAPServer(
 			b.CrashHandler,
-			c.String("log-imap") == "client" || c.String("log-imap") == "all",
-			c.String("log-imap") == "server" || c.String("log-imap") == "all",
-			imapPort, tlsConfig, imapBackend, b.Listener).ListenAndServe()
+			c.String(flagLogIMAP) == "client" || c.String(flagLogIMAP) == "all",
+			c.String(flagLogIMAP) == "server" || c.String(flagLogIMAP) == "all",
+			imapPort, tlsConfig, imapBackend, b.UserAgent, b.Listener).ListenAndServe()
 	}()

 	go func() {
@ -89,12 +95,12 @@ func run(b *base.Base, c *cli.Context) error { // nolint[funlen]
 		smtpPort := b.Settings.GetInt(settings.SMTPPortKey)
 		useSSL := b.Settings.GetBool(settings.SMTPSSLKey)
 		smtp.NewSMTPServer(
-			c.Bool("log-smtp"),
+			c.Bool(flagLogSMTP),
 			smtpPort, useSSL, tlsConfig, smtpBackend, b.Listener).ListenAndServe()
 	}()

 	// Bridge supports no-window option which we should use for autostart.
-	b.Autostart.Exec = append(b.Autostart.Exec, "--no-window")
+	b.Autostart.Exec = append(b.Autostart.Exec, "--"+flagNoWindow)

 	// We want to remove old versions if the app exits successfully.
 	b.AddTeardownAction(b.Versioner.RemoveOldVersions)
@ -105,9 +111,9 @@ func run(b *base.Base, c *cli.Context) error { // nolint[funlen]
 	var frontendMode string

 	switch {
-	case c.Bool("cli"):
+	case c.Bool(base.FlagCLI):
 		frontendMode = "cli"
-	case c.Bool("noninteractive"):
+	case c.Bool(flagNonInteractive):
 		return <-(make(chan error)) // Block forever.
 	default:
 		frontendMode = "qt"
@ -118,12 +124,13 @@ func run(b *base.Base, c *cli.Context) error { // nolint[funlen]
 		constants.BuildVersion,
 		b.Name,
 		frontendMode,
-		!c.Bool("no-window"),
+		!c.Bool(flagNoWindow),
 		b.CrashHandler,
 		b.Locations,
 		b.Settings,
 		b.Listener,
 		b.Updater,
+		b.UserAgent,
 		bridge,
 		smtpBackend,
 		b.Autostart,
@ -132,7 +139,7 @@ func run(b *base.Base, c *cli.Context) error { // nolint[funlen]

 	// Watch for updates routine
 	go func() {
-		ticker := time.NewTicker(time.Hour)
+		ticker := time.NewTicker(constants.UpdateCheckInterval)

 		for {
 			checkAndHandleUpdate(b.Updater, f, b.Settings.GetBool(settings.AutoUpdateKey))
--- a/internal/app/ie/ie.go
+++ b/internal/app/ie/ie.go
@ -49,7 +49,7 @@ func run(b *base.Base, c *cli.Context) error {
 	var frontendMode string

 	switch {
-	case c.Bool("cli"):
+	case c.Bool(base.FlagCLI):
 		frontendMode = "cli"
 	default:
 		frontendMode = "qt"
--- a/internal/bridge/bridge.go
+++ b/internal/bridge/bridge.go
@ -26,6 +26,7 @@ import (
 	"github.com/ProtonMail/proton-bridge/internal/config/settings"
 	"github.com/ProtonMail/proton-bridge/internal/constants"
 	"github.com/ProtonMail/proton-bridge/internal/metrics"
+	"github.com/ProtonMail/proton-bridge/internal/sentry"
 	"github.com/ProtonMail/proton-bridge/internal/updater"
 	"github.com/ProtonMail/proton-bridge/internal/users"
 	"github.com/ProtonMail/proton-bridge/pkg/pmapi"
@ -46,16 +47,13 @@ type Bridge struct {
 	clientManager users.ClientManager
 	updater       Updater
 	versioner     Versioner
-
-	userAgentClientName    string
-	userAgentClientVersion string
-	userAgentOS            string
 }

 func New(
 	locations Locator,
 	cache Cacher,
 	s SettingsProvider,
+	sentryReporter *sentry.Reporter,
 	panicHandler users.PanicHandler,
 	eventListener listener.Listener,
 	clientManager users.ClientManager,
@ -69,7 +67,7 @@ func New(
 		clientManager.AllowProxy()
 	}

-	storeFactory := newStoreFactory(cache, panicHandler, clientManager, eventListener)
+	storeFactory := newStoreFactory(cache, sentryReporter, panicHandler, clientManager, eventListener)
 	u := users.New(locations, panicHandler, eventListener, clientManager, credStorer, storeFactory, true)
 	b := &Bridge{
 		Users: u,
@ -118,40 +116,6 @@ func (b *Bridge) heartbeat() {
 	}
 }

-// GetCurrentClient returns currently connected client (e.g. Thunderbird).
-func (b *Bridge) GetCurrentClient() string {
-	res := b.userAgentClientName
-	if b.userAgentClientVersion != "" {
-		res = res + " " + b.userAgentClientVersion
-	}
-	return res
-}
-
-// SetCurrentClient updates client info (e.g. Thunderbird) and sets the user agent
-// on pmapi. By default no client is used, IMAP has to detect it on first login.
-func (b *Bridge) SetCurrentClient(clientName, clientVersion string) {
-	b.userAgentClientName = clientName
-	b.userAgentClientVersion = clientVersion
-	b.updateUserAgent()
-}
-
-// SetCurrentOS updates OS and sets the user agent on pmapi. By default we use
-// `runtime.GOOS`, but this can be overridden in case of better detection.
-func (b *Bridge) SetCurrentOS(os string) {
-	b.userAgentOS = os
-	b.updateUserAgent()
-}
-
-func (b *Bridge) updateUserAgent() {
-	logrus.
-		WithField("clientName", b.userAgentClientName).
-		WithField("clientVersion", b.userAgentClientVersion).
-		WithField("OS", b.userAgentOS).
-		Info("Updating user agent")
-
-	b.clientManager.SetUserAgent(b.userAgentClientName, b.userAgentClientVersion, b.userAgentOS)
-}
-
 // ReportBug reports a new bug from the user.
 func (b *Bridge) ReportBug(osType, osVersion, description, accountName, address, emailClient string) error {
 	c := b.clientManager.GetAnonymousClient()
@ -187,26 +151,41 @@ func (b *Bridge) GetUpdateChannel() updater.UpdateChannel {
 // Downgrading to previous version (by switching from early to stable, for example)
 // requires clearing all data including update files due to possibility of
 // inconsistency between versions and absence of backwards migration scripts.
-func (b *Bridge) SetUpdateChannel(channel updater.UpdateChannel) error {
+func (b *Bridge) SetUpdateChannel(channel updater.UpdateChannel) (needRestart bool, err error) {
 	b.settings.Set(settings.UpdateChannelKey, string(channel))

 	version, err := b.updater.Check()
 	if err != nil {
-		return err
+		return false, err
+	}
+
+	// We have to deal right away only with downgrade - that action needs to
+	// clear data and updates, and install bridge right away. But regular
+	// upgrade can be leaved out for periodic check.
+	if !b.updater.IsDowngrade(version) {
+		return false, nil
 	}

-	if b.updater.IsDowngrade(version) {
 	if err := b.Users.ClearData(); err != nil {
 		log.WithError(err).Error("Failed to clear data while downgrading channel")
 	}
 	if err := b.locations.ClearUpdates(); err != nil {
 		log.WithError(err).Error("Failed to clear updates while downgrading channel")
 	}
-	}

 	if err := b.updater.InstallUpdate(version); err != nil {
-		return err
+		return false, err
 	}

-	return b.versioner.RemoveOtherVersions(version.Version)
+	return true, b.versioner.RemoveOtherVersions(version.Version)
+}
+
+// GetKeychainApp returns current keychain helper.
+func (b *Bridge) GetKeychainApp() string {
+	return b.settings.Get(settings.PreferredKeychainKey)
+}
+
+// SetKeychainApp sets current keychain helper.
+func (b *Bridge) SetKeychainApp(helper string) {
+	b.settings.Set(settings.PreferredKeychainKey, helper)
 }
--- a/internal/bridge/credits.go
+++ b/internal/bridge/credits.go
@ -1,22 +0,0 @@
-// Copyright (c) 2021 Proton Technologies AG
-//
-// This file is part of ProtonMail Bridge.
-//
-// ProtonMail Bridge is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// ProtonMail Bridge is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
-
-// Code generated by ./credits.sh at Mon Feb 1 10:34:22 CET 2021. DO NOT EDIT.
-
-package bridge
-
-const Credits = "github.com/0xAX/notificator;github.com/Masterminds/semver/v3;github.com/ProtonMail/bcrypt;github.com/ProtonMail/crypto;github.com/ProtonMail/docker-credential-helpers;github.com/ProtonMail/go-autostart;github.com/ProtonMail/go-imap;github.com/ProtonMail/go-imap-id;github.com/ProtonMail/go-rfc5322;github.com/ProtonMail/go-vcard;github.com/ProtonMail/gopenpgp/v2;github.com/PuerkitoBio/goquery;github.com/abiosoft/ishell;github.com/abiosoft/readline;github.com/allan-simon/go-singleinstance;github.com/chzyer/logex;github.com/chzyer/test;github.com/cucumber/godog;github.com/docker/docker-credential-helpers;github.com/emersion/go-imap;github.com/emersion/go-imap-appendlimit;github.com/emersion/go-imap-idle;github.com/emersion/go-imap-move;github.com/emersion/go-imap-quota;github.com/emersion/go-imap-unselect;github.com/emersion/go-mbox;github.com/emersion/go-message;github.com/emersion/go-sasl;github.com/emersion/go-smtp;github.com/emersion/go-textwrapper;github.com/emersion/go-vcard;github.com/fatih/color;github.com/flynn-archive/go-shlex;github.com/getsentry/sentry-go;github.com/go-resty/resty/v2;github.com/golang/mock;github.com/google/go-cmp;github.com/google/uuid;github.com/gopherjs/gopherjs;github.com/hashicorp/go-multierror;github.com/jameskeane/bcrypt;github.com/jaytaylor/html2text;github.com/keybase/go-keychain;github.com/logrusorgru/aurora;github.com/mattn/go-runewidth;github.com/miekg/dns;github.com/nsf/jsondiff;github.com/olekukonko/tablewriter;github.com/pkg/errors;github.com/sirupsen/logrus;github.com/skratchdot/open-golang;github.com/ssor/bom;github.com/stretchr/testify;github.com/therecipe/qt;github.com/urfave/cli/v2;github.com/vmihailenco/msgpack/v5;go.etcd.io/bbolt;golang.org/x/crypto;golang.org/x/net;golang.org/x/text;;Font Awesome 4.7.0;;Qt 5.13 by Qt group;"
--- a/internal/bridge/store_factory.go
+++ b/internal/bridge/store_factory.go
@ -21,14 +21,15 @@ import (
 	"fmt"
 	"path/filepath"

+	"github.com/ProtonMail/proton-bridge/internal/sentry"
 	"github.com/ProtonMail/proton-bridge/internal/store"
 	"github.com/ProtonMail/proton-bridge/internal/users"
-
 	"github.com/ProtonMail/proton-bridge/pkg/listener"
 )

 type storeFactory struct {
 	cache          Cacher
+	sentryReporter *sentry.Reporter
 	panicHandler   users.PanicHandler
 	clientManager  users.ClientManager
 	eventListener  listener.Listener
@ -37,12 +38,14 @@ type storeFactory struct {

 func newStoreFactory(
 	cache Cacher,
+	sentryReporter *sentry.Reporter,
 	panicHandler users.PanicHandler,
 	clientManager users.ClientManager,
 	eventListener listener.Listener,
 ) *storeFactory {
 	return &storeFactory{
 		cache:          cache,
+		sentryReporter: sentryReporter,
 		panicHandler:   panicHandler,
 		clientManager:  clientManager,
 		eventListener:  eventListener,
@ -53,7 +56,7 @@ func newStoreFactory(
 // New creates new store for given user.
 func (f *storeFactory) New(user store.BridgeUser) (*store.Store, error) {
 	storePath := getUserStorePath(f.cache.GetDBDir(), user.ID())
-	return store.New(f.panicHandler, user, f.clientManager, f.eventListener, storePath, f.storeCache)
+	return store.New(f.sentryReporter, f.panicHandler, user, f.clientManager, f.eventListener, storePath, f.storeCache)
 }

 // Remove removes all store files for given user.
--- a/internal/config/settings/kvs.go
+++ b/internal/config/settings/kvs.go
@ -21,6 +21,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"io/ioutil"
 	"os"
 	"strconv"
 	"sync"
@ -73,13 +74,12 @@ func (p *keyValueStore) save() error {
 	p.lock.Lock()
 	defer p.lock.Unlock()

-	f, err := os.Create(p.path)
+	b, err := json.MarshalIndent(p.cache, "", "\t")
 	if err != nil {
 		return err
 	}
-	defer f.Close() //nolint[errcheck]

-	return json.NewEncoder(f).Encode(p.cache)
+	return ioutil.WriteFile(p.path, b, 0600)
 }

 func (p *keyValueStore) setDefault(key, value string) {
--- a/internal/config/settings/kvs_test.go
+++ b/internal/config/settings/kvs_test.go
@ -72,20 +72,20 @@ func TestKeyValueStoreSetDefault(t *testing.T) {
 func TestKeyValueStoreSet(t *testing.T) {
 	pref := newTestEmptyKeyValueStore(t)
 	pref.Set("str", "value")
-	checkSavedKeyValueStore(t, "{\"str\":\"value\"}")
+	checkSavedKeyValueStore(t, "{\n\t\"str\": \"value\"\n}")
 }

 func TestKeyValueStoreSetInt(t *testing.T) {
 	pref := newTestEmptyKeyValueStore(t)
 	pref.SetInt("int", 42)
-	checkSavedKeyValueStore(t, "{\"int\":\"42\"}")
+	checkSavedKeyValueStore(t, "{\n\t\"int\": \"42\"\n}")
 }

 func TestKeyValueStoreSetBool(t *testing.T) {
 	pref := newTestEmptyKeyValueStore(t)
 	pref.SetBool("trueBool", true)
 	pref.SetBool("falseBool", false)
-	checkSavedKeyValueStore(t, "{\"falseBool\":\"false\",\"trueBool\":\"true\"}")
+	checkSavedKeyValueStore(t, "{\n\t\"falseBool\": \"false\",\n\t\"trueBool\": \"true\"\n}")
 }

 func newTestEmptyKeyValueStore(t *testing.T) *keyValueStore {
@ -101,5 +101,5 @@ func newTestKeyValueStore(t *testing.T) *keyValueStore {
 func checkSavedKeyValueStore(t *testing.T, expected string) {
 	data, err := ioutil.ReadFile(testPrefFilePath)
 	require.NoError(t, err)
-	require.Equal(t, expected+"\n", string(data))
+	require.Equal(t, expected, string(data))
 }
--- a/internal/config/useragent/platform.go
+++ b/internal/config/useragent/platform.go
@ -25,29 +25,27 @@ import (
 	"github.com/Masterminds/semver/v3"
 )

-// IsCatalinaOrNewer checks that host is MacOS Catalina 10.15.x or higher.
+// IsCatalinaOrNewer checks whether host is MacOS Catalina 10.15.x or higher.
 func IsCatalinaOrNewer() bool {
 	if runtime.GOOS != "darwin" {
 		return false
 	}
-	return isVersionCatalinaOrNewer(getMacVersion())
-}

-func getMacVersion() string {
-	out, err := exec.Command("sw_vers", "-productVersion").Output()
-	if err != nil {
-		return ""
-	}
-
-	return strings.TrimSpace(string(out))
-}
-
-func isVersionCatalinaOrNewer(version string) bool {
-	v, err := semver.NewVersion(version)
+	rawVersion, err := exec.Command("sw_vers", "-productVersion").Output()
 	if err != nil {
 		return false
 	}

-	catalina := semver.MustParse("10.15.0")
-	return v.GreaterThan(catalina) || v.Equal(catalina)
+	return isVersionCatalinaOrNewer(strings.TrimSpace(string(rawVersion)))
+}
+
+func isVersionCatalinaOrNewer(rawVersion string) bool {
+	semVersion, err := semver.NewVersion(rawVersion)
+	if err != nil {
+		return false
+	}
+
+	minVersion := semver.MustParse("10.15.0")
+
+	return semVersion.GreaterThan(minVersion) || semVersion.Equal(minVersion)
 }
--- a/internal/config/useragent/platform_test.go
+++ b/internal/config/useragent/platform_test.go
--- a/internal/config/useragent/useragent.go
+++ b/internal/config/useragent/useragent.go
@ -15,38 +15,45 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.

-package pmapi
+package useragent

 import (
 	"fmt"
+	"regexp"
 	"runtime"
-	"strings"
 )

-// removeBrackets handle unwanted brackets in client identification string and join with given joinBy parameter.
-// Mac OS X Mail/13.0 (3601.0.4) -> Mac OS X Mail/13.0-3601.0.4 (joinBy = "-")
-func removeBrackets(s string, joinBy string) (r string) {
-	r = strings.ReplaceAll(s, " (", joinBy)
-	r = strings.ReplaceAll(r, "(", joinBy) // Should be faster than regex.
-	r = strings.ReplaceAll(r, ")", "")
-
-	return
+type UserAgent struct {
+	client, platform string
 }

-func formatUserAgent(clientName, clientVersion, os string) string {
-	client := ""
-	if clientName != "" {
-		client = removeBrackets(clientName, "-")
-		if clientVersion != "" {
-			client += "/" + removeBrackets(clientVersion, "-")
+func New() *UserAgent {
+	return &UserAgent{
+		client:   "",
+		platform: runtime.GOOS,
 	}
 }

-	if os == "" {
-		os = runtime.GOOS
+func (ua *UserAgent) SetClient(name, version string) {
+	ua.client = fmt.Sprintf("%v/%v", name, regexp.MustCompile(`(.*) \((.*)\)`).ReplaceAllString(version, "$1-$2"))
 }

-	os = removeBrackets(os, " ")
-
-	return fmt.Sprintf("%s (%s)", client, os)
+func (ua *UserAgent) HasClient() bool {
+	return ua.client != ""
+}
+
+func (ua *UserAgent) SetPlatform(platform string) {
+	ua.platform = platform
+}
+
+func (ua *UserAgent) String() string {
+	var client string
+
+	if ua.client != "" {
+		client = ua.client
+	} else {
+		client = "NoClient/0.0.1"
+	}
+
+	return fmt.Sprintf("%v (%v)", client, ua.platform)
 }
--- a/internal/config/useragent/useragent_test.go
+++ b/internal/config/useragent/useragent_test.go
@ -0,0 +1,86 @@
+// Copyright (c) 2021 Proton Technologies AG
+//
+// This file is part of ProtonMail Bridge.
+//
+// ProtonMail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// ProtonMail Bridge is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
+
+package useragent
+
+import (
+	"fmt"
+	"runtime"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestUserAgent(t *testing.T) {
+	tests := []struct {
+		name, version, platform string
+		want                    string
+	}{
+		// No name/version, no platform.
+		{
+			want: fmt.Sprintf("NoClient/0.0.1 (%v)", runtime.GOOS),
+		},
+
+		// No name/version, with platform.
+		{
+			platform: "macOS 10.15",
+			want:     "NoClient/0.0.1 (macOS 10.15)",
+		},
+
+		// With name/version, with platform.
+		{
+			name:     "Mac OS X Mail",
+			version:  "1.0.0",
+			platform: "macOS 10.15",
+			want:     "Mac OS X Mail/1.0.0 (macOS 10.15)",
+		},
+
+		// With name/version, with platform.
+		{
+			name:     "Mac OS X Mail",
+			version:  "13.4 (3608.120.23.2.4)",
+			platform: "macOS 10.15",
+			want:     "Mac OS X Mail/13.4-3608.120.23.2.4 (macOS 10.15)",
+		},
+
+		// With name/version, with platform.
+		{
+			name:     "Thunderbird",
+			version:  "78.6.1",
+			platform: "Windows 10 (10.0)",
+			want:     "Thunderbird/78.6.1 (Windows 10 (10.0))",
+		},
+	}
+
+	for _, test := range tests {
+		test := test
+
+		t.Run(test.want, func(t *testing.T) {
+			ua := New()
+
+			if test.name != "" && test.version != "" {
+				ua.SetClient(test.name, test.version)
+			}
+
+			if test.platform != "" {
+				ua.SetPlatform(test.platform)
+			}
+
+			assert.Equal(t, test.want, ua.String())
+		})
+	}
+}
--- a/internal/constants/update_default.go
+++ b/internal/constants/update_default.go
@ -0,0 +1,28 @@
+// Copyright (c) 2021 Proton Technologies AG
+//
+// This file is part of ProtonMail Bridge.
+//
+// ProtonMail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// ProtonMail Bridge is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
+
+// +build !build_qa
+
+package constants
+
+import "time"
+
+// nolint[gochecknoglobals]
+var (
+	// UpdateCheckInterval defines how often we check for new version
+	UpdateCheckInterval = time.Hour //nolint[gochecknoglobals]
+)
--- a/internal/constants/update_qa.go
+++ b/internal/constants/update_qa.go
@ -0,0 +1,28 @@
+// Copyright (c) 2021 Proton Technologies AG
+//
+// This file is part of ProtonMail Bridge.
+//
+// ProtonMail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// ProtonMail Bridge is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
+
+// +build build_qa
+
+package constants
+
+import "time"
+
+// nolint[gochecknoglobals]
+var (
+	// UpdateCheckInterval defines how often we check for new version
+	UpdateCheckInterval = time.Duration(5 * time.Minute)
+)
--- a/internal/crash/handler.go
+++ b/internal/crash/handler.go
@ -19,7 +19,7 @@
 package crash

 import (
-	"github.com/ProtonMail/proton-bridge/pkg/sentry"
+	"github.com/ProtonMail/proton-bridge/internal/sentry"
 	"github.com/sirupsen/logrus"
 )

--- a/internal/frontend/cli/frontend.go
+++ b/internal/frontend/cli/frontend.go
@ -102,10 +102,6 @@ func New( //nolint[funlen]
 		Aliases: []string{"p"},
 		Func:    fe.changePort,
 	})
-	changeCmd.AddCmd(&ishell.Cmd{Name: "proxy",
-		Help: "allow or disallow bridge to securely connect to proton via a third party when it is being blocked",
-		Func: fe.toggleAllowProxy,
-	})
 	changeCmd.AddCmd(&ishell.Cmd{Name: "smtp-security",
 		Help:    "change port numbers of IMAP and SMTP servers.(alias: ssl, starttls)",
 		Aliases: []string{"ssl", "starttls"},
@ -113,13 +109,56 @@ func New( //nolint[funlen]
 	})
 	fe.AddCmd(changeCmd)

-	// Check commands.
-	checkCmd := &ishell.Cmd{Name: "check", Help: "check internet connection or new version."}
-	checkCmd.AddCmd(&ishell.Cmd{Name: "updates",
-		Help:    "check for Bridge updates. (aliases: u, v, version)",
-		Aliases: []string{"u", "version", "v"},
+	// DoH commands.
+	dohCmd := &ishell.Cmd{Name: "proxy",
+		Help: "allow or disallow bridge to securely connect to proton via a third party when it is being blocked",
+	}
+	dohCmd.AddCmd(&ishell.Cmd{Name: "allow",
+		Help: "allow bridge to securely connect to proton via a third party when it is being blocked",
+		Func: fe.allowProxy,
+	})
+	dohCmd.AddCmd(&ishell.Cmd{Name: "disallow",
+		Help: "disallow bridge to securely connect to proton via a third party when it is being blocked",
+		Func: fe.disallowProxy,
+	})
+	fe.AddCmd(dohCmd)
+
+	// Updates commands.
+	updatesCmd := &ishell.Cmd{Name: "updates",
+		Help: "manage bridge updates",
+	}
+	updatesCmd.AddCmd(&ishell.Cmd{Name: "check",
+		Help: "check for Bridge updates",
 		Func: fe.checkUpdates,
 	})
+	autoUpdatesCmd := &ishell.Cmd{Name: "autoupdates",
+		Help: "manage bridge updates",
+	}
+	updatesCmd.AddCmd(autoUpdatesCmd)
+	autoUpdatesCmd.AddCmd(&ishell.Cmd{Name: "enable",
+		Help: "automatically keep bridge up to date",
+		Func: fe.enableAutoUpdates,
+	})
+	autoUpdatesCmd.AddCmd(&ishell.Cmd{Name: "disable",
+		Help: "require bridge to be manually updated",
+		Func: fe.disableAutoUpdates,
+	})
+	updatesChannelCmd := &ishell.Cmd{Name: "channel",
+		Help: "switch updates channel",
+	}
+	updatesCmd.AddCmd(updatesChannelCmd)
+	updatesChannelCmd.AddCmd(&ishell.Cmd{Name: "early",
+		Help: "switch to the early-access updates channel",
+		Func: fe.selectEarlyChannel,
+	})
+	updatesChannelCmd.AddCmd(&ishell.Cmd{Name: "stable",
+		Help: "switch to the stable updates channel",
+		Func: fe.selectStableChannel,
+	})
+	fe.AddCmd(updatesCmd)
+
+	// Check commands.
+	checkCmd := &ishell.Cmd{Name: "check", Help: "check internet connection or new version."}
 	checkCmd.AddCmd(&ishell.Cmd{Name: "internet",
 		Help:    "check internet connection. (aliases: i, conn, connection)",
 		Aliases: []string{"i", "con", "connection"},
--- a/internal/frontend/cli/system.go
+++ b/internal/frontend/cli/system.go
@ -132,20 +132,32 @@ func (f *frontendCLI) changePort(c *ishell.Context) {
 	}
 }

-func (f *frontendCLI) toggleAllowProxy(c *ishell.Context) {
+func (f *frontendCLI) allowProxy(c *ishell.Context) {
 	if f.settings.GetBool(settings.AllowProxyKey) {
-		f.Println("Bridge is currently set to use alternative routing to connect to Proton if it is being blocked.")
-		if f.yesNoQuestion("Are you sure you want to stop bridge from doing this") {
-			f.settings.SetBool(settings.AllowProxyKey, false)
-			f.bridge.DisallowProxy()
+		f.Println("Bridge is already set to use alternative routing to connect to Proton if it is being blocked.")
+		return
 	}
-	} else {
+
 	f.Println("Bridge is currently set to NOT use alternative routing to connect to Proton if it is being blocked.")
+
 	if f.yesNoQuestion("Are you sure you want to allow bridge to do this") {
 		f.settings.SetBool(settings.AllowProxyKey, true)
 		f.bridge.AllowProxy()
 	}
 }
+
+func (f *frontendCLI) disallowProxy(c *ishell.Context) {
+	if !f.settings.GetBool(settings.AllowProxyKey) {
+		f.Println("Bridge is already set to NOT use alternative routing to connect to Proton if it is being blocked.")
+		return
+	}
+
+	f.Println("Bridge is currently set to use alternative routing to connect to Proton if it is being blocked.")
+
+	if f.yesNoQuestion("Are you sure you want to stop bridge from doing this") {
+		f.settings.SetBool(settings.AllowProxyKey, false)
+		f.bridge.DisallowProxy()
+	}
 }

 func (f *frontendCLI) isPortFree(port string) bool {
--- a/internal/frontend/cli/updates.go
+++ b/internal/frontend/cli/updates.go
@ -21,15 +21,92 @@ import (
 	"strings"

 	"github.com/ProtonMail/proton-bridge/internal/bridge"
+	"github.com/ProtonMail/proton-bridge/internal/config/settings"
+	"github.com/ProtonMail/proton-bridge/internal/updater"
 	"github.com/abiosoft/ishell"
 )

 func (f *frontendCLI) checkUpdates(c *ishell.Context) {
+	version, err := f.updater.Check()
+	if err != nil {
+		f.Println("An error occurred while checking for updates.")
+		return
+	}
+
+	if f.updater.IsUpdateApplicable(version) {
+		f.Println("An update is available.")
+	} else {
 		f.Println("Your version is up to date.")
 	}
+}

 func (f *frontendCLI) printCredits(c *ishell.Context) {
 	for _, pkg := range strings.Split(bridge.Credits, ";") {
 		f.Println(pkg)
 	}
 }
+
+func (f *frontendCLI) enableAutoUpdates(c *ishell.Context) {
+	if f.settings.GetBool(settings.AutoUpdateKey) {
+		f.Println("Bridge is already set to automatically install updates.")
+		return
+	}
+
+	f.Println("Bridge is currently set to NOT automatically install updates.")
+
+	if f.yesNoQuestion("Are you sure you want to allow bridge to do this") {
+		f.settings.SetBool(settings.AutoUpdateKey, true)
+	}
+}
+
+func (f *frontendCLI) disableAutoUpdates(c *ishell.Context) {
+	if !f.settings.GetBool(settings.AutoUpdateKey) {
+		f.Println("Bridge is already set to NOT automatically install updates.")
+		return
+	}
+
+	f.Println("Bridge is currently set to automatically install updates.")
+
+	if f.yesNoQuestion("Are you sure you want to stop bridge from doing this") {
+		f.settings.SetBool(settings.AutoUpdateKey, false)
+	}
+}
+
+func (f *frontendCLI) selectEarlyChannel(c *ishell.Context) {
+	if f.bridge.GetUpdateChannel() == updater.EarlyChannel {
+		f.Println("Bridge is already on the early-access update channel.")
+		return
+	}
+
+	f.Println("Bridge is currently on the stable update channel.")
+
+	if f.yesNoQuestion("Are you sure you want to switch to the early-access update channel") {
+		needRestart, err := f.bridge.SetUpdateChannel(updater.EarlyChannel)
+		if err != nil {
+			f.Println("There was a problem switching update channel.")
+		}
+		if needRestart {
+			f.restarter.SetToRestart()
+		}
+	}
+}
+
+func (f *frontendCLI) selectStableChannel(c *ishell.Context) {
+	if f.bridge.GetUpdateChannel() == updater.StableChannel {
+		f.Println("Bridge is already on the stable update channel.")
+		return
+	}
+
+	f.Println("Bridge is currently on the early-access update channel.")
+	f.Println("Switching to the stable channel may reset all data!")
+
+	if f.yesNoQuestion("Are you sure you want to switch to the stable update channel") {
+		needRestart, err := f.bridge.SetUpdateChannel(updater.StableChannel)
+		if err != nil {
+			f.Println("There was a problem switching update channel.")
+		}
+		if needRestart {
+			f.restarter.SetToRestart()
+		}
+	}
+}
--- a/internal/frontend/frontend.go
+++ b/internal/frontend/frontend.go
@ -22,6 +22,7 @@ import (
 	"github.com/ProtonMail/go-autostart"
 	"github.com/ProtonMail/proton-bridge/internal/bridge"
 	"github.com/ProtonMail/proton-bridge/internal/config/settings"
+	"github.com/ProtonMail/proton-bridge/internal/config/useragent"
 	"github.com/ProtonMail/proton-bridge/internal/frontend/cli"
 	cliie "github.com/ProtonMail/proton-bridge/internal/frontend/cli-ie"
 	"github.com/ProtonMail/proton-bridge/internal/frontend/qt"
@ -60,6 +61,7 @@ func New(
 	settings *settings.Settings,
 	eventListener listener.Listener,
 	updater types.Updater,
+	userAgent *useragent.UserAgent,
 	bridge *bridge.Bridge,
 	noEncConfirmator types.NoEncConfirmator,
 	autostart *autostart.App,
@ -77,6 +79,7 @@ func New(
 		settings,
 		eventListener,
 		updater,
+		userAgent,
 		bridgeWrap,
 		noEncConfirmator,
 		autostart,
@ -95,6 +98,7 @@ func newBridgeFrontend(
 	settings *settings.Settings,
 	eventListener listener.Listener,
 	updater types.Updater,
+	userAgent *useragent.UserAgent,
 	bridge types.Bridger,
 	noEncConfirmator types.NoEncConfirmator,
 	autostart *autostart.App,
@ -122,6 +126,7 @@ func newBridgeFrontend(
 			settings,
 			eventListener,
 			updater,
+			userAgent,
 			bridge,
 			noEncConfirmator,
 			autostart,
--- a/internal/frontend/qml/BridgeUI/DialogKeychainChange.qml
+++ b/internal/frontend/qml/BridgeUI/DialogKeychainChange.qml
@ -0,0 +1,194 @@
+// Copyright (c) 2021 Proton Technologies AG
+//
+// This file is part of ProtonMail Bridge.
+//
+// ProtonMail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// ProtonMail Bridge is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
+
+// Change default keychain dialog
+
+import QtQuick 2.8
+import BridgeUI 1.0
+import ProtonUI 1.0
+import QtQuick.Controls 2.2 as QC
+import QtQuick.Layouts 1.0
+
+Dialog {
+    id: root
+
+    title : "Change which keychain Bridge uses as default"
+    subtitle : "Select which keychain is used (Bridge will automatically restart)"
+    isDialogBusy: currentIndex==1
+
+    property var selectedKeychain
+
+    Connections {
+        target: go.selectedKeychain
+        onValueChanged: {
+            console.debug("go.selectedKeychain == ", go.selectedKeychain)
+        }
+    }
+
+    ColumnLayout {
+        Layout.fillHeight: true
+        Layout.fillWidth: true
+
+        Item {
+            Layout.fillWidth: true
+            Layout.minimumHeight: root.titleHeight + Style.dialog.heightSeparator
+            Layout.maximumHeight: root.titleHeight + Style.dialog.heightSeparator
+        }
+
+        Item {
+            Layout.fillHeight: true
+            Layout.fillWidth: true
+
+            ColumnLayout {
+                anchors.centerIn: parent
+
+                Repeater {
+                    id: keychainRadioButtons
+                    model: go.availableKeychain
+                    QC.RadioButton {
+                        id: radioDelegate
+                        text: modelData
+                        checked: go.selectedKeychain === modelData
+
+                        Layout.alignment: Qt.AlignHCenter | Qt.AlignVCenter
+                        spacing: Style.main.spacing
+
+                        indicator: Text {
+                            text  : radioDelegate.checked ? Style.fa.check_circle : Style.fa.circle_o
+                            color : radioDelegate.checked ? Style.main.textBlue   : Style.main.textInactive
+                            font {
+                                pointSize: Style.dialog.iconSize * Style.pt
+                                family: Style.fontawesome.name
+                            }
+                        }
+                        contentItem: Text {
+                            text: radioDelegate.text
+                            color: Style.main.text
+                            font {
+                                pointSize: Style.dialog.fontSize * Style.pt
+                                bold: checked
+                            }
+                            horizontalAlignment : Text.AlignHCenter
+                            verticalAlignment   : Text.AlignVCenter
+                            leftPadding: Style.dialog.iconSize
+                        }
+
+                        onCheckedChanged: {
+                            if (checked) {
+                                root.selectedKeychain = modelData
+                            }
+                        }
+                    }
+                }
+
+                Item {
+                    Layout.fillWidth: true
+                    Layout.minimumHeight: Style.dialog.heightSeparator
+                    Layout.maximumHeight: Style.dialog.heightSeparator
+                }
+
+                Row {
+                    id: buttonRow
+                    Layout.alignment: Qt.AlignHCenter | Qt.AlignVCenter
+                    spacing: Style.dialog.spacing
+                    ButtonRounded {
+                        id:buttonNo
+                        color_main: Style.dialog.text
+                        fa_icon: Style.fa.times
+                        text: qsTr("Cancel", "dismisses current action")
+                        onClicked : root.hide()
+                    }
+                    ButtonRounded {
+                        id: buttonYes
+                        color_main: Style.dialog.text
+                        color_minor: Style.main.textBlue
+                        isOpaque: true
+                        fa_icon: Style.fa.check
+                        text: qsTr("Okay", "confirms and dismisses a notification")
+                        onClicked : root.confirmed()
+                    }
+                }
+            }
+        }
+    }
+
+    ColumnLayout {
+        Layout.fillHeight: true
+        Layout.fillWidth: true
+
+        Item {
+            Layout.fillWidth: true
+            Layout.minimumHeight: root.titleHeight + Style.dialog.heightSeparator
+            Layout.maximumHeight: root.titleHeight + Style.dialog.heightSeparator
+        }
+
+        Item {
+            Layout.fillHeight: true
+            Layout.fillWidth: true
+            Layout.alignment: Qt.AlignHCenter | Qt.AlignVCenter
+
+            Text {
+                id: answ
+                anchors.horizontalCenter: parent.horizontalCenter
+                anchors.verticalCenter: parent.verticalCenter
+                width : parent.width/2
+                color: Style.dialog.text
+                font {
+                    pointSize : Style.dialog.fontSize * Style.pt
+                    bold      : true
+                }
+                text : "Default keychain is now set to " + root.selectedKeychain +
+                "\n\n" +
+                qsTr("Settings will be applied after the next start.", "notification about setting being applied after next start") +
+                "\n\n" +
+                qsTr("Bridge will now restart.", "notification about restarting")
+                wrapMode: Text.Wrap
+                horizontalAlignment: Text.AlignHCenter
+            }
+        }
+    }
+
+    Shortcut {
+        sequence: StandardKey.Cancel
+        onActivated: root.hide()
+    }
+
+    Shortcut {
+        sequence: "Enter"
+        onActivated: root.confirmed()
+    }
+
+    function confirmed() {
+        if (selectedKeychain === go.selectedKeychain) {
+            root.hide()
+            return
+        }
+
+        incrementCurrentIndex()
+        timer.start()
+    }
+
+    timer.interval : 5000
+
+    Connections {
+        target: timer
+        onTriggered: {
+            // This action triggers restart on the backend side.
+            go.selectedKeychain = selectedKeychain
+        }
+    }
+}
--- a/internal/frontend/qml/BridgeUI/DialogYesNo.qml
+++ b/internal/frontend/qml/BridgeUI/DialogYesNo.qml
@ -229,7 +229,7 @@ Dialog {
                currentIndex : 0
                title        : qsTr("Clear cache", "title of page that displays during cache clearing")
                question     : qsTr("Are you sure you want to clear your local cache?", "displays during cache clearing")
-                note         : qsTr("This will delete all of your stored preferences as well as cached email data for all accounts, temporarily slowing down the email download process significantly.", "displays during cache clearing")
+                note         : qsTr("This will delete all of your stored preferences as well as cached email data for all accounts, and requires you to reconfigure your client.", "displays during cache clearing")
                answer       : qsTr("Clearing the cache ...", "displays during cache clearing")
            }
        },
@ -310,7 +310,7 @@ Dialog {
                target: root
                currentIndex : 0
                question     : qsTr("Are you sure you want to leave early access? Please keep in mind this operation clears the cache and restarts Bridge.")
-                note         : qsTr("This will delete all of your stored preferences as well as cached email data for all accounts, temporarily slowing down the email download process significantly.")
+                note         : qsTr("This will delete all of your stored preferences as well as cached email data for all accounts, and requires you to reconfigure your client.")
                title        : qsTr("Disable early access")
                answer       : qsTr("Disabling early access...")
            }
--- a/internal/frontend/qml/BridgeUI/MainWindow.qml
+++ b/internal/frontend/qml/BridgeUI/MainWindow.qml
@ -303,6 +303,10 @@ Window {
        id: dialogChangePort
    }

+    DialogKeychainChange {
+        id: dialogChangeKeychain
+    }
+
    DialogConnectionTroubleshoot {
        id: dialogConnectionTroubleshoot
    }
--- a/internal/frontend/qml/BridgeUI/SettingsView.qml
+++ b/internal/frontend/qml/BridgeUI/SettingsView.qml
@ -239,6 +239,25 @@ Item {
                    dialogGlobal.show()
                }
            }
+
+            ButtonIconText {
+                id: changeKeychain
+                visible: advancedSettings.isAdvanced && (go.availableKeychain.length > 1)
+                text: qsTr("Change keychain", "button to open dialog with default keychain selection")
+                leftIcon.text  : Style.fa.key
+                rightIcon {
+                    text : qsTr("Change", "clickable link next to change keychain button in settings")
+                    color: Style.main.text
+                    font {
+                        family : changeKeychain.font.family // use default font, not font-awesome
+                        pointSize : Style.settings.fontSize * Style.pt
+                        underline : true
+                    }
+                }
+                onClicked: {
+                    dialogChangeKeychain.show()
+                }
+            }
        }
    }
 }
--- a/internal/frontend/qml/BridgeUI/qmldir
+++ b/internal/frontend/qml/BridgeUI/qmldir
@ -2,6 +2,7 @@ module BridgeUI
 AccountDelegate    1.0 AccountDelegate.qml
 Credits            1.0 Credits.qml
 DialogFirstStart   1.0 DialogFirstStart.qml
+DialogKeychainChange 1.0 DialogKeychainChange.qml
 DialogPortChange   1.0 DialogPortChange.qml
 DialogYesNo        1.0 DialogYesNo.qml
 DialogTLSCertInfo  1.0 DialogTLSCertInfo.qml
--- a/internal/frontend/qml/Gui.qml
+++ b/internal/frontend/qml/Gui.qml
@ -107,17 +107,53 @@ Item {
            gui.openMainWindow(false)
            if (go.isConnectionOK) {
                if( winMain.updateState=="noInternet") {
-                    go.setUpdateState("upToDate")
+                    go.updateState = "upToDate"
                }
            } else {
-                go.setUpdateState("noInternet")
+                go.updateState = "noInternet"
            }
        }

-        onSetUpdateState : {
+        onUpdateStateChanged : {
+            // Update tray icon if needed
+            switch (go.updateState) {
+                case "internetCheck":
+                    break;
+                case "noInternet" :
+                    gui.warningFlags |= Style.warnInfoBar
+                    break;
+                case "oldVersion":
+                    gui.warningFlags |= Style.warnInfoBar
+                    break;
+                case "forceUpdate":
+                    // Force update should presist once it happened and never be overwritten.
+                    // That means that tray icon should allways remain in error state.
+                    // But since we have only two sources of error icon in tray (force update 
+                    // + installation fail) and both are unrecoverable and we do not ever remove
+                    // error flag from gui.warningFlags - it is ok to rely on gui.warningFlags and
+                    // not on winMain.updateState (which presist forceUpdate)
+                    gui.warningFlags |= Style.errorInfoBar
+                    break;
+                case "upToDate":
+                    gui.warningFlags &= ~Style.warnInfoBar
+                    break;
+                case "updateRestart":
+                    gui.warningFlags |= Style.warnInfoBar
+                    break;
+                case "updateError":
+                    gui.warningFlags |= Style.errorInfoBar
+                    break;
+                default :
+                    break;
+            }
+
+            // if main window is closed - most probably it is destroyed (see closeMainWindow())
+            if (winMain == null) {
+                return
+            }
            // once app is outdated prevent from state change
            if (winMain.updateState != "forceUpdate") {
-                winMain.updateState = updateState
+                winMain.updateState = go.updateState
            }
        }

@ -129,15 +165,14 @@ Item {
        }

        onNotifyManualUpdate: {
-            go.setUpdateState("oldVersion")
+            go.updateState = "oldVersion"
        }

        onNotifyManualUpdateRestartNeeded: {
            if (!winMain.dialogUpdate.visible) {
-                gui.openMainWindow(true)
                winMain.dialogUpdate.show()
            }
-            go.setUpdateState("updateRestart")
+            go.updateState = "updateRestart"
            winMain.dialogUpdate.finished(false)

            // after manual update - just retart immidiatly
@ -147,28 +182,25 @@ Item {

        onNotifyManualUpdateError: {
            if (!winMain.dialogUpdate.visible) {
-                gui.openMainWindow(true)
                winMain.dialogUpdate.show()
            }
-            go.setUpdateState("updateError")
+            go.updateState = "updateError"
            winMain.dialogUpdate.finished(true)
        }

        onNotifyForceUpdate : {
-            go.setUpdateState("forceUpdate")
+            go.updateState = "forceUpdate"
            if (!winMain.dialogUpdate.visible) {
-                gui.openMainWindow(true)
                winMain.dialogUpdate.show()
            }
        }

        onNotifySilentUpdateRestartNeeded: {
-            go.setUpdateState("updateRestart")
+            go.updateState = "updateRestart"
        }

        onNotifySilentUpdateError: {
-            go.setUpdateState("updateError")
-            gui.openMainWindow(true)
+            go.updateState = "updateError"
        }

        onNotifyLogout : {
@ -287,9 +319,17 @@ Item {
        if (showAndRise) {
            gui.winMain.showAndRise()
        }
+
+        // restore update notification bar: trigger updateStateChanged
+        var tmp = go.updateState
+        go.updateState = ""
+        go.updateState = tmp
    }

    function closeMainWindow () {
+        // Historical reasons: once upon a time there was a report about high GPU
+        // usage on MacOS while bridge is closed. Legends say that destroying 
+        // MainWindow solved this.
        gui.winMain.hide()
        gui.winMain.destroy(5000)
        gui.winMain = null
--- a/internal/frontend/qml/GuiIE.qml
+++ b/internal/frontend/qml/GuiIE.qml
@ -30,7 +30,6 @@ Item {
    id: gui
    property alias winMain: winMain
    property bool isFirstWindow: true
-    property int warningFlags: 0

    property var locale    : Qt.locale("en_US")
    property date netBday  : new Date("1989-03-13T00:00:00")
@ -96,17 +95,17 @@ Item {
            go.isConnectionOK = isAvailable
            if (go.isConnectionOK) {
                if( winMain.updateState==gui.enums.statusNoInternet) {
-                    go.setUpdateState(gui.enums.statusUpToDate)
+                    go.updateState = gui.enums.statusUpToDate
                }
            } else {
-                go.setUpdateState(gui.enums.statusNoInternet)
+                go.updateState = gui.enums.statusNoInternet
            }
        }

-        onSetUpdateState : {
+        onUpdateStateChanged : {
            // once app is outdated prevent from state change
            if (winMain.updateState != "forceUpdate") {
-                winMain.updateState = updateState
+                winMain.updateState = go.updateState
            }
        }

@ -207,14 +206,14 @@ Item {
        }

        onNotifyManualUpdate: {
-            go.setUpdateState("oldVersion")
+            go.updateState = "oldVersion"
        }

        onNotifyManualUpdateRestartNeeded: {
            if (!winMain.dialogUpdate.visible) {
                winMain.dialogUpdate.show()
            }
-            go.setUpdateState("updateRestart")
+            go.updateState = "updateRestart"
            winMain.dialogUpdate.finished(false)

            // after manual update - just retart immidiatly
@ -226,23 +225,23 @@ Item {
            if (!winMain.dialogUpdate.visible) {
                winMain.dialogUpdate.show()
            }
-            go.setUpdateState("updateError")
+            go.updateState = "updateError"
            winMain.dialogUpdate.finished(true)
        }

        onNotifyForceUpdate : {
-            go.setUpdateState("forceUpdate")
+            go.updateState = "forceUpdate"
            if (!winMain.dialogUpdate.visible) {
                winMain.dialogUpdate.show()
            }
        }

        onNotifySilentUpdateRestartNeeded: {
-            go.setUpdateState("updateRestart")
+            go.updateState = "updateRestart"
        }

        onNotifySilentUpdateError: {
-            go.setUpdateState("updateError")
+            go.updateState = "updateError"
        }

        onNotifyLogout : {
--- a/internal/frontend/qml/ProtonUI/Dialog.qml
+++ b/internal/frontend/qml/ProtonUI/Dialog.qml
@ -111,6 +111,11 @@ StackLayout {
    Accessible.description: title
    Accessible.focusable: true

+    onVisibleChanged: {
+        if (background.visible != visible) {
+            background.visible = visible
+        }
+    }

    visible      : false
    anchors {
--- a/internal/frontend/qml/ProtonUI/InformationBar.qml
+++ b/internal/frontend/qml/ProtonUI/InformationBar.qml
@ -68,6 +68,7 @@ Rectangle {
            anchors.verticalCenter : message.verticalCenter
            iconText  : " "
            fontSize : root.fontSize
+            textUnderline: true
        }

        ClickIconText {
@ -109,26 +110,20 @@ Rectangle {
            case "internetCheck":
                break;
            case "noInternet" :
-            gui.warningFlags |= Style.warnInfoBar
                retryInternet.start()
                secLeft=checkInterval[iTry]
                break;
            case "oldVersion":
-            gui.warningFlags |= Style.warnInfoBar
                break;
            case "forceUpdate":
-            gui.warningFlags |= Style.errorInfoBar
                break;
            case "upToDate":
-            gui.warningFlags &= ~Style.warnInfoBar
                iTry = 0
                secLeft=checkInterval[iTry]
                break;
            case "updateRestart":
-            gui.warningFlags |= Style.warnInfoBar
                break;
            case "updateError":
-            gui.warningFlags |= Style.errorInfoBar
                break;
            default :
                break;
@ -247,7 +242,7 @@ Rectangle {
            PropertyChanges {
                target: linkText
                visible: true
-                text: "(" + qsTr("view release notes", "display the release notes from the new version") + ")"
+                text: qsTr("Release Notes", "display the release notes from the new version")
                onClicked: gui.openReleaseNotes()
            }
            PropertyChanges {
@ -270,7 +265,7 @@ Rectangle {
                target: closeSign
                visible: true
                onClicked: {
-                    root.state = "upToDate"
+                    go.updateState = "upToDate"
                }
            }
        },
--- a/internal/frontend/qml/tst_Gui.qml
+++ b/internal/frontend/qml/tst_Gui.qml
@ -24,7 +24,7 @@ import QtQuick.Window 2.2

 Window {
    id: testroot
-    width   : 150
+    width   : 250
    height  : 600
    flags   : Qt.Window | Qt.Dialog | Qt.FramelessWindowHint
    visible : true
@ -60,7 +60,7 @@ Window {
        Text {
            id: systrText
            anchors {
-                right : test_systray.right
+                horizontalCenter: parent.horizontalCenter
                verticalCenter: test_systray.verticalCenter
            }
            text: "unset"
@ -281,6 +281,9 @@ Window {

        property bool hasNoKeychain : true

+        property var availableKeychain: ["pass-app", "gnome-keyring"]
+        property var selectedKeychain: "gnome-keyring"
+
        property string wrongCredentials
        property string wrongMailboxPassword
        property string canNotReachAPI
@ -296,6 +299,7 @@ Window {
        property string fullversion : "QA.1.0 (d9f8sdf9) 2020-02-19T10:57:23+01:00"
        property string downloadLink: "https://protonmail.com/download/beta/protonmail-bridge-1.1.5-1.x86_64.rpm;https://www.protonmail.com/downloads/beta/Desktop-Bridge-link1.exe;https://www.protonmail.com/downloads/beta/Desktop-Bridge-link1.exe;https://www.protonmail.com/downloads/beta/Desktop-Bridge-link1.exe;"

+        property string updateState
        property string updateVersion : "QA.1.0"
        property bool updateCanInstall: true
        property string updateLandingPage : "https://protonmail.com/bridge/download/"
@ -337,7 +341,6 @@ Window {

        signal notifyPortIssue(bool busyPortIMAP, bool busyPortSMTP)
        signal notifyVersionIsTheLatest()
-        signal setUpdateState(string updateState)
        signal notifyKeychainRebuild()
        signal notifyHasNoKeychain()

--- a/internal/frontend/qml/tst_GuiIE.qml
+++ b/internal/frontend/qml/tst_GuiIE.qml
@ -856,6 +856,7 @@ Window {
        property string fullversion : "QA.1.0 (d9f8sdf9) 2020-02-19T10:57:23+01:00"
        property string downloadLink: "https://protonmail.com/download/beta/protonmail-bridge-1.1.5-1.x86_64.rpm;https://www.protonmail.com/downloads/beta/Desktop-Bridge-link1.exe;https://www.protonmail.com/downloads/beta/Desktop-Bridge-link1.exe;https://www.protonmail.com/downloads/beta/Desktop-Bridge-link1.exe;"

+        property string updateState
        property string updateVersion : "q0.1.0"
        property bool updateCanInstall: true
        property string updateLandingPage : "https://protonmail.com/import-export/download/"
@ -900,7 +901,6 @@ Window {
        signal showQuit()

        signal notifyVersionIsTheLatest()
-        signal setUpdateState(string updateState)

        signal showMainWin()
        signal hideMainWin()
--- a/internal/frontend/qt-common/account_model.go
+++ b/internal/frontend/qt-common/account_model.go
@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.

-// +build !nogui
+// +build build_qt

 package qtcommon

--- a/internal/frontend/qt-common/accounts.go
+++ b/internal/frontend/qt-common/accounts.go
@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.

-// +build !nogui
+// +build build_qt

 package qtcommon

--- a/internal/frontend/qt-common/common.cpp
+++ b/internal/frontend/qt-common/common.cpp
@ -1,4 +1,4 @@
-// +build !nogui
+// +build build_qt

 #include "common.h"
 #include "_cgo_export.h"
--- a/internal/frontend/qt-common/common.go
+++ b/internal/frontend/qt-common/common.go
@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.

-// +build !nogui
+// +build build_qt

 package qtcommon

--- a/internal/frontend/qt-common/notification.go
+++ b/internal/frontend/qt-common/notification.go
@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.

-// +build !nogui
+// +build build_qt

 package qtcommon

--- a/internal/frontend/qt-ie/enums.go
+++ b/internal/frontend/qt-ie/enums.go
@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.

-// +build !nogui
+// +build build_qt

 package qtie

--- a/internal/frontend/qt-ie/error_list.go
+++ b/internal/frontend/qt-ie/error_list.go
@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.

-// +build !nogui
+// +build build_qt

 package qtie

--- a/internal/frontend/qt-ie/export.go
+++ b/internal/frontend/qt-ie/export.go
@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.

-// +build !nogui
+// +build build_qt

 package qtie

--- a/internal/frontend/qt-ie/folder_functions.go
+++ b/internal/frontend/qt-ie/folder_functions.go
@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.

-// +build !nogui
+// +build build_qt

 package qtie

--- a/internal/frontend/qt-ie/folder_structure.go
+++ b/internal/frontend/qt-ie/folder_structure.go
@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.

-// +build !nogui
+// +build build_qt

 package qtie

--- a/internal/frontend/qt-ie/folder_structure_test.go
+++ b/internal/frontend/qt-ie/folder_structure_test.go
@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.

-// +build !nogui
+// +build build_qt

 package qtie

--- a/internal/frontend/qt-ie/frontend.go
+++ b/internal/frontend/qt-ie/frontend.go
@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.

-// +build !nogui
+// +build build_qt

 package qtie

--- a/internal/frontend/qt-ie/frontend_nogui.go
+++ b/internal/frontend/qt-ie/frontend_nogui.go
@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.

-// +build nogui
+// +build !build_qt

 package qtie

--- a/internal/frontend/qt-ie/import.go
+++ b/internal/frontend/qt-ie/import.go
@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.

-// +build !nogui
+// +build build_qt

 package qtie

--- a/internal/frontend/qt-ie/mbox.go
+++ b/internal/frontend/qt-ie/mbox.go
@ -16,7 +16,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.

-// +build !nogui
+// +build build_qt

 package qtie

--- a/internal/frontend/qt-ie/notification.go
+++ b/internal/frontend/qt-ie/notification.go
@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.

-// +build !nogui
+// +build build_qt

 package qtie

--- a/internal/frontend/qt-ie/path_status.go
+++ b/internal/frontend/qt-ie/path_status.go
@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.

-// +build !nogui
+// +build build_qt

 package qtie

--- a/internal/frontend/qt-ie/transfer_rules.go
+++ b/internal/frontend/qt-ie/transfer_rules.go
@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.

-// +build !nogui
+// +build build_qt

 package qtie

--- a/internal/frontend/qt-ie/ui.go
+++ b/internal/frontend/qt-ie/ui.go
@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.

-// +build !nogui
+// +build build_qt

 package qtie

@ -53,6 +53,7 @@ type GoQMLInterface struct {
 	_ string `property:"fullversion"`
 	_ string `property:"downloadLink"`

+	_ string `property:"updateState"`
 	_ string `property:"updateVersion"`
 	_ bool   `property:"updateCanInstall"`
 	_ string `property:"updateLandingPage"`
@ -77,7 +78,6 @@ type GoQMLInterface struct {
 	_ string `property:"versionCheckFailed"`
 	//
 	_ func(isAvailable bool)   `signal:"setConnectionStatus"`
-	_ func(updateState string) `signal:"setUpdateState"`
 	_ func()                   `slot:"checkInternet"`

 	_ func() `slot:"setToRestart"`
--- a/internal/frontend/qt/accountModel.go
+++ b/internal/frontend/qt/accountModel.go
@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.

-// +build !nogui
+// +build build_qt

 package qt

--- a/internal/frontend/qt/accounts.go
+++ b/internal/frontend/qt/accounts.go
@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.

-// +build !nogui
+// +build build_qt

 package qt

@ -84,7 +84,7 @@ func (s *FrontendQt) clearCache() {

 	channel := s.bridge.GetUpdateChannel()
 	if channel == updater.EarlyChannel {
-		if err := s.bridge.SetUpdateChannel(updater.StableChannel); err != nil {
+		if _, err := s.bridge.SetUpdateChannel(updater.StableChannel); err != nil {
 			s.Qml.NotifyManualUpdateError()
 			return
 		}
--- a/internal/frontend/qt/frontend.go
+++ b/internal/frontend/qt/frontend.go
@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.

-// +build !nogui
+// +build build_qt

 // Package qt is the Qt User interface for Desktop bridge.
 //
@ -39,16 +39,17 @@ import (
 	"github.com/ProtonMail/go-autostart"
 	"github.com/ProtonMail/proton-bridge/internal/bridge"
 	"github.com/ProtonMail/proton-bridge/internal/config/settings"
+	"github.com/ProtonMail/proton-bridge/internal/config/useragent"
 	"github.com/ProtonMail/proton-bridge/internal/events"
 	"github.com/ProtonMail/proton-bridge/internal/frontend/autoconfig"
 	qtcommon "github.com/ProtonMail/proton-bridge/internal/frontend/qt-common"
 	"github.com/ProtonMail/proton-bridge/internal/frontend/types"
 	"github.com/ProtonMail/proton-bridge/internal/locations"
 	"github.com/ProtonMail/proton-bridge/internal/updater"
+	"github.com/ProtonMail/proton-bridge/pkg/keychain"
 	"github.com/ProtonMail/proton-bridge/pkg/listener"
 	"github.com/ProtonMail/proton-bridge/pkg/pmapi"
 	"github.com/ProtonMail/proton-bridge/pkg/ports"
-	"github.com/ProtonMail/proton-bridge/pkg/useragent"
 	"github.com/sirupsen/logrus"
 	"github.com/skratchdot/open-golang/open"
 	"github.com/therecipe/qt/core"
@ -74,6 +75,7 @@ type FrontendQt struct {
 	settings          *settings.Settings
 	eventListener     listener.Listener
 	updater           types.Updater
+	userAgent         *useragent.UserAgent
 	bridge            types.Bridger
 	noEncConfirmator  types.NoEncConfirmator

@ -113,12 +115,15 @@ func New(
 	settings *settings.Settings,
 	eventListener listener.Listener,
 	updater types.Updater,
+	userAgent *useragent.UserAgent,
 	bridge types.Bridger,
 	noEncConfirmator types.NoEncConfirmator,
 	autostart *autostart.App,
 	restarter types.Restarter,
 ) *FrontendQt {
-	tmp := &FrontendQt{
+	userAgent.SetPlatform(core.QSysInfo_PrettyProductName())
+
+	f := &FrontendQt{
 		version:           version,
 		buildVersion:      buildVersion,
 		programName:       programName,
@ -128,6 +133,7 @@ func New(
 		settings:          settings,
 		eventListener:     eventListener,
 		updater:           updater,
+		userAgent:         userAgent,
 		bridge:            bridge,
 		noEncConfirmator:  noEncConfirmator,
 		programVer:        "v" + version,
@ -137,13 +143,9 @@ func New(

 	// Initializing.Done is only called sync.Once. Please keep the increment
 	// set to 1
-	tmp.initializing.Add(1)
+	f.initializing.Add(1)

-	// Nicer string for OS.
-	currentOS := core.QSysInfo_PrettyProductName()
-	bridge.SetCurrentOS(currentOS)
-
-	return tmp
+	return f
 }

 // InstanceExistAlert is a global warning window indicating an instance already exists.
@ -338,27 +340,35 @@ func (s *FrontendQt) qtExecute(Procedure func(*FrontendQt) error) error {
 	s.Qml.SetCredits(bridge.Credits)
 	s.Qml.SetFullversion(s.buildVersion)

-	// Autostart.
-	if s.Qml.IsFirstStart() {
-		if s.autostart.IsEnabled() {
+	// Autostart: rewrite the current definition of autostart
+	//  - when it is the first time
+	//  - when starting after clear cache
+	//  - when there is already autostart file from past
+	//
+	//  This will make sure that autostart will use the latest path to
+	//  launcher or bridge.
+	isAutoStartEnabled := s.autostart.IsEnabled()
+	if s.Qml.IsFirstStart() || isAutoStartEnabled {
+		if isAutoStartEnabled {
 			if err := s.autostart.Disable(); err != nil {
-				log.Error("First disable ", err)
+				log.
+					WithField("first", s.Qml.IsFirstStart()).
+					WithField("wasEnabled", isAutoStartEnabled).
+					WithError(err).
+					Error("Disable on start failed.")
 				s.autostartError(err)
 			}
 		}
-		s.toggleAutoStart()
+		if err := s.autostart.Enable(); err != nil {
+			log.
+				WithField("first", s.Qml.IsFirstStart()).
+				WithField("wasEnabled", isAutoStartEnabled).
+				WithError(err).
+				Error("Enable on start failed.")
+			s.autostartError(err)
 		}
-	if s.autostart.IsEnabled() {
-		s.Qml.SetIsAutoStart(true)
-	} else {
-		s.Qml.SetIsAutoStart(false)
-	}
-
-	if s.settings.GetBool(settings.AutoUpdateKey) {
-		s.Qml.SetIsAutoUpdate(true)
-	} else {
-		s.Qml.SetIsAutoUpdate(false)
 	}
+	s.Qml.SetIsAutoStart(s.autostart.IsEnabled())

 	if s.settings.GetBool(settings.AllowProxyKey) {
 		s.Qml.SetIsProxyAllowed(true)
@ -372,6 +382,14 @@ func (s *FrontendQt) qtExecute(Procedure func(*FrontendQt) error) error {
 		s.Qml.SetIsEarlyAccess(false)
 	}

+	availableKeychain := []string{}
+	for chain := range keychain.Helpers {
+		availableKeychain = append(availableKeychain, chain)
+	}
+	s.Qml.SetAvailableKeychain(availableKeychain)
+
+	s.Qml.SetSelectedKeychain(s.settings.Get(settings.PreferredKeychainKey))
+
 	// Set reporting of outgoing email without encryption.
 	s.Qml.SetIsReportingOutgoingNoEnc(s.settings.GetBool(settings.ReportOutgoingNoEncKey))

@ -497,7 +515,7 @@ func (s *FrontendQt) sendBug(description, client, address string) (isOK bool) {
 }

 func (s *FrontendQt) getLastMailClient() string {
-	return s.bridge.GetCurrentClient()
+	return s.userAgent.String()
 }

 func (s *FrontendQt) configureAppleMail(iAccount, iAddress int) {
@ -547,20 +565,22 @@ func (s *FrontendQt) configureAppleMail(iAccount, iAddress int) {
 func (s *FrontendQt) toggleAutoStart() {
 	defer s.Qml.ProcessFinished()
 	var err error
-	if s.autostart.IsEnabled() {
+	wasEnabled := s.autostart.IsEnabled()
+	if wasEnabled {
 		err = s.autostart.Disable()
 	} else {
 		err = s.autostart.Enable()
 	}
+	isEnabled := s.autostart.IsEnabled()
 	if err != nil {
-		log.Error("Enable autostart: ", err)
+		log.
+			WithField("wasEnabled", wasEnabled).
+			WithField("isEnabled", isEnabled).
+			WithError(err).
+			Error("Autostart change failed.")
 		s.autostartError(err)
 	}
-	if s.autostart.IsEnabled() {
-		s.Qml.SetIsAutoStart(true)
-	} else {
-		s.Qml.SetIsAutoStart(false)
-	}
+	s.Qml.SetIsAutoStart(isEnabled)
 }

 func (s *FrontendQt) toggleAutoUpdate() {
@ -585,15 +605,17 @@ func (s *FrontendQt) toggleEarlyAccess() {
 		channel = updater.EarlyChannel
 	}

-	err := s.bridge.SetUpdateChannel(channel)
+	needRestart, err := s.bridge.SetUpdateChannel(channel)
 	s.Qml.SetIsEarlyAccess(channel == updater.EarlyChannel)
 	if err != nil {
 		s.Qml.NotifyManualUpdateError()
 		return
 	}
+	if needRestart {
 		s.restarter.SetToRestart()
 		s.App.Quit()
 	}
+}

 func (s *FrontendQt) toggleAllowProxy() {
 	defer s.Qml.ProcessFinished()
@ -711,3 +733,16 @@ func (s *FrontendQt) setGUIIsReady() {
 		s.initializing.Done()
 	})
 }
+
+func (s *FrontendQt) getKeychain() string {
+	return s.bridge.GetKeychainApp()
+}
+
+func (s *FrontendQt) setKeychain(keychain string) {
+	if keychain != s.bridge.GetKeychainApp() {
+		s.bridge.SetKeychainApp(keychain)
+
+		s.restarter.SetToRestart()
+		s.App.Quit()
+	}
+}
--- a/internal/frontend/qt/frontend_nogui.go
+++ b/internal/frontend/qt/frontend_nogui.go
@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.

-// +build nogui
+// +build !build_qt

 package qt

@ -25,6 +25,7 @@ import (

 	"github.com/ProtonMail/go-autostart"
 	"github.com/ProtonMail/proton-bridge/internal/config/settings"
+	"github.com/ProtonMail/proton-bridge/internal/config/useragent"
 	"github.com/ProtonMail/proton-bridge/internal/frontend/types"
 	"github.com/ProtonMail/proton-bridge/internal/locations"
 	"github.com/ProtonMail/proton-bridge/internal/updater"
@ -71,6 +72,7 @@ func New(
 	settings *settings.Settings,
 	eventListener listener.Listener,
 	updater types.Updater,
+	userAgent *useragent.UserAgent,
 	bridge types.Bridger,
 	noEncConfirmator types.NoEncConfirmator,
 	autostart *autostart.App,
--- a/internal/frontend/qt/helpers.go
+++ b/internal/frontend/qt/helpers.go
@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.

-// +build !nogui
+// +build build_qt

 package qt

--- a/internal/frontend/qt/notification.go
+++ b/internal/frontend/qt/notification.go
@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.

-// +build !nogui
+// +build build_qt

 package qt

--- a/internal/frontend/qt/systray.go
+++ b/internal/frontend/qt/systray.go
@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.

-// +build !nogui
+// +build build_qt

 package qt

--- a/internal/frontend/qt/ui.go
+++ b/internal/frontend/qt/ui.go
@ -15,7 +15,7 @@
 // You should have received a copy of the GNU General Public License
 // along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.

-// +build !nogui
+// +build build_qt

 package qt

@ -50,6 +50,7 @@ type GoQMLInterface struct {
 	_ string `property:"fullversion"`
 	_ string `property:"downloadLink"`

+	_ string `property:"updateState"`
 	_ string `property:"updateVersion"`
 	_ bool   `property:"updateCanInstall"`
 	_ string `property:"updateLandingPage"`
@ -66,6 +67,9 @@ type GoQMLInterface struct {
 	_ func() `slot:"startManualUpdate"`
 	_ func() `slot:"guiIsReady"`

+	_ []string `property:"availableKeychain"`
+	_ string   `property:"selectedKeychain"`
+
 	// Translations.
 	_ string `property:"wrongCredentials"`
 	_ string `property:"wrongMailboxPassword"`
@ -80,7 +84,6 @@ type GoQMLInterface struct {
 	_ string  `property:"progressDescription"`

 	_ func(isAvailable bool) `signal:"setConnectionStatus"`
-	_ func(updateState string) `signal:"setUpdateState"`
 	_ func()                 `slot:"checkInternet"`

 	_ func() `slot:"setToRestart"`
@ -209,4 +212,7 @@ func (s *GoQMLInterface) SetFrontend(f *FrontendQt) {
 	s.ConnectToggleIsReportingOutgoingNoEnc(f.toggleIsReportingOutgoingNoEnc)
 	s.ConnectShouldSendAnswer(f.shouldSendAnswer)
 	s.ConnectSaveOutgoingNoEncPopupCoord(f.saveOutgoingNoEncPopupCoord)
+
+	s.ConnectSetSelectedKeychain(f.setKeychain)
+	s.ConnectSelectedKeychain(f.getKeychain)
 }
--- a/internal/frontend/resources.qrc
+++ b/internal/frontend/resources.qrc
@ -61,6 +61,7 @@
        <file alias="BubbleMenu.qml"         >./qml/BridgeUI/BubbleMenu.qml</file>
        <file alias="Credits.qml"            >./qml/BridgeUI/Credits.qml</file>
        <file alias="DialogFirstStart.qml"   >./qml/BridgeUI/DialogFirstStart.qml</file>
+        <file alias="DialogKeychainChange.qml"   >./qml/BridgeUI/DialogKeychainChange.qml</file>
        <file alias="DialogPortChange.qml"   >./qml/BridgeUI/DialogPortChange.qml</file>
        <file alias="DialogYesNo.qml"        >./qml/BridgeUI/DialogYesNo.qml</file>
        <file alias="DialogTLSCertInfo.qml"  >./qml/BridgeUI/DialogTLSCertInfo.qml</file>
--- a/internal/frontend/types/types.go
+++ b/internal/frontend/types/types.go
@ -75,13 +75,13 @@ type User interface {
 type Bridger interface {
 	UserManager

-	GetCurrentClient() string
-	SetCurrentOS(os string)
 	ReportBug(osType, osVersion, description, accountName, address, emailClient string) error
 	AllowProxy()
 	DisallowProxy()
 	GetUpdateChannel() updater.UpdateChannel
-	SetUpdateChannel(updater.UpdateChannel) error
+	SetUpdateChannel(updater.UpdateChannel) (needRestart bool, err error)
+	GetKeychainApp() string
+	SetKeychainApp(keychain string)
 }

 type bridgeWrap struct {
--- a/internal/imap/bridge.go
+++ b/internal/imap/bridge.go
@ -29,7 +29,6 @@ type cacheProvider interface {
 }

 type bridger interface {
-	SetCurrentClient(clientName, clientVersion string)
 	GetUser(query string) (bridgeUser, error)
 }

--- a/internal/imap/id/extension.go
+++ b/internal/imap/id/extension.go
@ -23,13 +23,13 @@ import (
 )

 type currentClientSetter interface {
-	SetCurrentClient(name, version string)
+	SetClient(name, version string)
 }

 // Extension for IMAP server
 type extension struct {
 	extID        imapserver.ConnExtension
-	setter currentClientSetter
+	clientSetter currentClientSetter
 }

 func (ext *extension) Capabilities(conn imapserver.Conn) []string {
@ -45,7 +45,7 @@ func (ext *extension) Command(name string) imapserver.HandlerFactory {
 		if hdlrID, ok := newIDHandler().(*imapid.Handler); ok {
 			return &handler{
 				hdlrID:       hdlrID,
-				setter: ext.setter,
+				clientSetter: ext.clientSetter,
 			}
 		}
 		return nil
@ -58,7 +58,7 @@ func (ext *extension) NewConn(conn imapserver.Conn) imapserver.Conn {

 type handler struct {
 	hdlrID       *imapid.Handler
-	setter currentClientSetter
+	clientSetter currentClientSetter
 }

 func (hdlr *handler) Parse(fields []interface{}) error {
@ -69,21 +69,18 @@ func (hdlr *handler) Handle(conn imapserver.Conn) error {
 	err := hdlr.hdlrID.Handle(conn)
 	if err == nil {
 		id := hdlr.hdlrID.Command.ID
-		hdlr.setter.SetCurrentClient(
-			id[imapid.FieldName],
-			id[imapid.FieldVersion],
-		)
+		hdlr.clientSetter.SetClient(id[imapid.FieldName], id[imapid.FieldVersion])
 	}
 	return err
 }

 // NewExtension returns extension which is adding RFC2871 ID capability, with
 // direct interface to set information about email client to backend.
-func NewExtension(serverID imapid.ID, setter currentClientSetter) imapserver.Extension {
+func NewExtension(serverID imapid.ID, clientSetter currentClientSetter) imapserver.Extension {
 	if conExtID, ok := imapid.NewExtension(serverID).(imapserver.ConnExtension); ok {
 		return &extension{
 			extID:        conExtID,
-			setter: setter,
+			clientSetter: clientSetter,
 		}
 	}
 	return nil
--- a/internal/imap/mailbox.go
+++ b/internal/imap/mailbox.go
@ -19,6 +19,7 @@ package imap

 import (
 	"strings"
+	"time"

 	"github.com/ProtonMail/proton-bridge/pkg/message"
 	"github.com/ProtonMail/proton-bridge/pkg/pmapi"
@ -56,6 +57,25 @@ func newIMAPMailbox(panicHandler panicHandler, user *imapUser, storeMailbox stor
 	}
 }

+// logCommand is helper to log commands requested by IMAP client with their
+// params, result, and duration, but without private data.
+// It's logged as INFO so it's logged for every user by default. This should
+// help devs to find out reasons why clients, mostly Apple Mail, does re-sync.
+// FETCH, APPEND, STORE, COPY, MOVE, and EXPUNGE should be using this helper.
+func (im *imapMailbox) logCommand(callback func() error, cmd string, params ...interface{}) error {
+	start := time.Now()
+	err := callback()
+	// Not using im.log to not include addressID which is not needed in this case.
+	log.WithFields(logrus.Fields{
+		"userID":   im.storeUser.UserID(),
+		"labelID":  im.storeMailbox.LabelID(),
+		"duration": time.Since(start),
+		"err":      err,
+		"params":   params,
+	}).Info(cmd)
+	return err
+}
+
 // Name returns this mailbox name.
 func (im *imapMailbox) Name() string {
 	// Called from go-imap in goroutines - we need to handle panics for each function.
@ -177,17 +197,16 @@ func (im *imapMailbox) Check() error {
 // Expunge permanently removes all messages that have the \Deleted flag set
 // from the currently selected mailbox.
 func (im *imapMailbox) Expunge() error {
-	// Wait for any APPENDS to finish in order to avoid data loss when
-	// Outlook sends commands too quickly STORE \Deleted, APPEND, EXPUNGE,
-	// APPEND FINISHED:
-	//
-	// Based on Outlook APPEND request we will not create new message but
-	// move the original to desired mailbox. If the message is currently
-	// in Trash or Spam and EXPUNGE happens before APPEND processing is
-	// finished the message is deleted from Proton instead of moved to
-	// the desired mailbox.
-	im.user.waitForAppend()
+	// See comment of appendExpungeLock.
+	if im.storeMailbox.LabelID() == pmapi.TrashLabel || im.storeMailbox.LabelID() == pmapi.SpamLabel {
+		im.user.appendExpungeLock.Lock()
+		defer im.user.appendExpungeLock.Unlock()
+	}

+	return im.logCommand(im.expunge, "EXPUNGE")
+}
+
+func (im *imapMailbox) expunge() error {
 	im.user.backend.updates.block(im.user.currentAddressLowercase, im.name, operationDeleteMessage)
 	defer im.user.backend.updates.unblock(im.user.currentAddressLowercase, im.name, operationDeleteMessage)

@ -197,6 +216,18 @@ func (im *imapMailbox) Expunge() error {
 // UIDExpunge permanently removes messages that have the \Deleted flag set
 // and UID passed from SeqSet from the currently selected mailbox.
 func (im *imapMailbox) UIDExpunge(seqSet *imap.SeqSet) error {
+	return im.logCommand(func() error {
+		return im.uidExpunge(seqSet)
+	}, "UID EXPUNGE", seqSet)
+}
+
+func (im *imapMailbox) uidExpunge(seqSet *imap.SeqSet) error {
+	// See comment of appendExpungeLock.
+	if im.storeMailbox.LabelID() == pmapi.TrashLabel || im.storeMailbox.LabelID() == pmapi.SpamLabel {
+		im.user.appendExpungeLock.Lock()
+		defer im.user.appendExpungeLock.Unlock()
+	}
+
 	im.user.backend.updates.block(im.user.currentAddressLowercase, im.name, operationDeleteMessage)
 	defer im.user.backend.updates.unblock(im.user.currentAddressLowercase, im.name, operationDeleteMessage)

--- a/internal/imap/mailbox_message.go
+++ b/internal/imap/mailbox_message.go
@ -66,13 +66,16 @@ func (dnc *doNotCacheError) errorOrNil() error {
 //
 // If the Backend implements Updater, it must notify the client immediately
 // via a mailbox update.
-func (im *imapMailbox) CreateMessage(flags []string, date time.Time, body imap.Literal) error { // nolint[funlen]
+func (im *imapMailbox) CreateMessage(flags []string, date time.Time, body imap.Literal) error {
+	return im.logCommand(func() error {
+		return im.createMessage(flags, date, body)
+	}, "APPEND", flags, date)
+}
+
+func (im *imapMailbox) createMessage(flags []string, date time.Time, body imap.Literal) error { // nolint[funlen]
 	// Called from go-imap in goroutines - we need to handle panics for each function.
 	defer im.panicHandler.HandlePanic()

-	im.user.appendStarted()
-	defer im.user.appendFinished()
-
 	m, _, _, readers, err := message.Parse(body)
 	if err != nil {
 		return err
@ -154,6 +157,9 @@ func (im *imapMailbox) CreateMessage(flags []string, date time.Time, body imap.L
 		}
 	}

+	im.user.appendExpungeLock.Lock()
+	defer im.user.appendExpungeLock.Unlock()
+
 	// Avoid appending a message which is already on the server. Apply the
 	// new label instead. This always happens with Outlook (it uses APPEND
 	// instead of COPY).
--- a/internal/imap/mailbox_messages.go
+++ b/internal/imap/mailbox_messages.go
@ -38,6 +38,12 @@ import (
 // If the Backend implements Updater, it must notify the client immediately
 // via a message update.
 func (im *imapMailbox) UpdateMessagesFlags(uid bool, seqSet *imap.SeqSet, operation imap.FlagsOp, flags []string) error {
+	return im.logCommand(func() error {
+		return im.updateMessagesFlags(uid, seqSet, operation, flags)
+	}, "STORE", uid, seqSet, operation, flags)
+}
+
+func (im *imapMailbox) updateMessagesFlags(uid bool, seqSet *imap.SeqSet, operation imap.FlagsOp, flags []string) error {
 	log.WithFields(logrus.Fields{
 		"flags":     flags,
 		"operation": operation,
@ -198,6 +204,12 @@ func (im *imapMailbox) addOrRemoveFlags(operation imap.FlagsOp, messageIDs, flag
 // destination mailbox. The flags and internal date of the message(s) SHOULD
 // be preserved, and the Recent flag SHOULD be set, in the copy.
 func (im *imapMailbox) CopyMessages(uid bool, seqSet *imap.SeqSet, targetLabel string) error {
+	return im.logCommand(func() error {
+		return im.copyMessages(uid, seqSet, targetLabel)
+	}, "COPY", uid, seqSet, targetLabel)
+}
+
+func (im *imapMailbox) copyMessages(uid bool, seqSet *imap.SeqSet, targetLabel string) error {
 	// Called from go-imap in goroutines - we need to handle panics for each function.
 	defer im.panicHandler.HandlePanic()

@ -209,6 +221,12 @@ func (im *imapMailbox) CopyMessages(uid bool, seqSet *imap.SeqSet, targetLabel s
 // This should not be used until MOVE extension has option to send UIDPLUS
 // responses.
 func (im *imapMailbox) MoveMessages(uid bool, seqSet *imap.SeqSet, targetLabel string) error {
+	return im.logCommand(func() error {
+		return im.moveMessages(uid, seqSet, targetLabel)
+	}, "MOVE", uid, seqSet, targetLabel)
+}
+
+func (im *imapMailbox) moveMessages(uid bool, seqSet *imap.SeqSet, targetLabel string) error {
 	// Called from go-imap in goroutines - we need to handle panics for each function.
 	defer im.panicHandler.HandlePanic()

@ -463,7 +481,13 @@ func (im *imapMailbox) SearchMessages(isUID bool, criteria *imap.SearchCriteria)
 // 3501 section 6.4.5 for a list of items that can be requested.
 //
 // Messages must be sent to msgResponse. When the function returns, msgResponse must be closed.
-func (im *imapMailbox) ListMessages(isUID bool, seqSet *imap.SeqSet, items []imap.FetchItem, msgResponse chan<- *imap.Message) (err error) { //nolint[funlen]
+func (im *imapMailbox) ListMessages(isUID bool, seqSet *imap.SeqSet, items []imap.FetchItem, msgResponse chan<- *imap.Message) error {
+	return im.logCommand(func() error {
+		return im.listMessages(isUID, seqSet, items, msgResponse)
+	}, "FETCH", isUID, seqSet, items)
+}
+
+func (im *imapMailbox) listMessages(isUID bool, seqSet *imap.SeqSet, items []imap.FetchItem, msgResponse chan<- *imap.Message) (err error) { //nolint[funlen]
 	defer func() {
 		close(msgResponse)
 		if err != nil {
--- a/internal/imap/server.go
+++ b/internal/imap/server.go
@ -28,6 +28,7 @@ import (

 	imapid "github.com/ProtonMail/go-imap-id"
 	"github.com/ProtonMail/proton-bridge/internal/bridge"
+	"github.com/ProtonMail/proton-bridge/internal/config/useragent"
 	"github.com/ProtonMail/proton-bridge/internal/events"
 	"github.com/ProtonMail/proton-bridge/internal/imap/id"
 	"github.com/ProtonMail/proton-bridge/internal/imap/uidplus"
@ -39,6 +40,7 @@ import (
 	imapmove "github.com/emersion/go-imap-move"
 	imapquota "github.com/emersion/go-imap-quota"
 	imapunselect "github.com/emersion/go-imap-unselect"
+	"github.com/emersion/go-imap/backend"
 	imapserver "github.com/emersion/go-imap/server"
 	"github.com/emersion/go-sasl"
 	"github.com/sirupsen/logrus"
@ -47,6 +49,7 @@ import (
 type imapServer struct {
 	panicHandler  panicHandler
 	server        *imapserver.Server
+	userAgent     *useragent.UserAgent
 	eventListener listener.Listener
 	debugClient   bool
 	debugServer   bool
@ -55,7 +58,7 @@ type imapServer struct {
 }

 // NewIMAPServer constructs a new IMAP server configured with the given options.
-func NewIMAPServer(panicHandler panicHandler, debugClient, debugServer bool, port int, tls *tls.Config, imapBackend *imapBackend, eventListener listener.Listener) *imapServer { //nolint[golint]
+func NewIMAPServer(panicHandler panicHandler, debugClient, debugServer bool, port int, tls *tls.Config, imapBackend backend.Backend, userAgent *useragent.UserAgent, eventListener listener.Listener) *imapServer { // nolint[golint]
 	s := imapserver.New(imapBackend)
 	s.Addr = fmt.Sprintf("%v:%v", bridge.Host, port)
 	s.TLSConfig = tls
@ -93,7 +96,7 @@ func NewIMAPServer(panicHandler panicHandler, debugClient, debugServer bool, por
 	s.Enable(
 		imapidle.NewExtension(),
 		imapmove.NewExtension(),
-		id.NewExtension(serverID, imapBackend.bridge),
+		id.NewExtension(serverID, userAgent),
 		imapquota.NewExtension(),
 		imapappendlimit.NewExtension(),
 		imapunselect.NewExtension(),
@ -103,6 +106,7 @@ func NewIMAPServer(panicHandler panicHandler, debugClient, debugServer bool, por
 	server := &imapServer{
 		panicHandler:  panicHandler,
 		server:        s,
+		userAgent:     userAgent,
 		eventListener: eventListener,
 		debugClient:   debugClient,
 		debugServer:   debugServer,
@ -144,9 +148,10 @@ func (s *imapServer) listenAndServe(retries int) {
 		return
 	}

-	err = s.server.Serve(&debugListener{
+	err = s.server.Serve(&connListener{
 		Listener:  l,
 		server:    s,
+		userAgent: s.userAgent,
 	})
 	// Serve returns error every time, even after closing the server.
 	// User shouldn't be notified about error if server shouldn't be running,
@ -233,18 +238,19 @@ func (s *imapServer) monitorDisconnectedUsers() {
 	}
 }

-// debugListener sets debug loggers on server containing fields with local
+// connListener sets debug loggers on server containing fields with local
 // and remote addresses right after new connection is accepted.
-type debugListener struct {
+type connListener struct {
 	net.Listener

 	server    *imapServer
+	userAgent *useragent.UserAgent
 }

-func (dl *debugListener) Accept() (net.Conn, error) {
-	conn, err := dl.Listener.Accept()
+func (l *connListener) Accept() (net.Conn, error) {
+	conn, err := l.Listener.Accept()

-	if err == nil && (dl.server.debugServer || dl.server.debugClient) {
+	if err == nil && (l.server.debugServer || l.server.debugClient) {
 		debugLog := log
 		if addr := conn.LocalAddr(); addr != nil {
 			debugLog = debugLog.WithField("loc", addr.String())
@ -254,14 +260,18 @@ func (dl *debugListener) Accept() (net.Conn, error) {
 		}

 		var localDebug, remoteDebug io.Writer
-		if dl.server.debugServer {
+		if l.server.debugServer {
 			localDebug = debugLog.WithField("pkg", "imap/server").WriterLevel(logrus.DebugLevel)
 		}
-		if dl.server.debugClient {
+		if l.server.debugClient {
 			remoteDebug = debugLog.WithField("pkg", "imap/client").WriterLevel(logrus.DebugLevel)
 		}

-		dl.server.server.Debug = imap.NewDebugWriter(localDebug, remoteDebug)
+		l.server.server.Debug = imap.NewDebugWriter(localDebug, remoteDebug)
+	}
+
+	if !l.userAgent.HasClient() {
+		l.userAgent.SetClient("UnknownClient", "0.0.1")
 	}

 	return conn, err
--- a/internal/imap/server_test.go
+++ b/internal/imap/server_test.go
@ -23,6 +23,7 @@ import (
 	"time"

 	"github.com/ProtonMail/proton-bridge/internal/bridge"
+	"github.com/ProtonMail/proton-bridge/internal/config/useragent"
 	"github.com/ProtonMail/proton-bridge/internal/events"
 	"github.com/ProtonMail/proton-bridge/pkg/listener"
 	"github.com/ProtonMail/proton-bridge/pkg/ports"
@ -48,6 +49,7 @@ func TestIMAPServerTurnOffAndOnAgain(t *testing.T) {
 		panicHandler:  panicHandler,
 		server:        server,
 		eventListener: eventListener,
+		userAgent:     useragent.New(),
 	}
 	s.isRunning.Store(false)

--- a/internal/imap/user.go
+++ b/internal/imap/user.go
@ -41,7 +41,22 @@ type imapUser struct {

 	currentAddressLowercase string

-	appendInProcess sync.WaitGroup
+	// Some clients, for example Outlook, do MOVE by STORE \Deleted, APPEND,
+	// EXPUNGE where APPEN and EXPUNGE can go in parallel. Usual IMAP servers
+	// do not deduplicate messages and this it's not an issue, but for APPEND
+	// for PM means just assigning label. That would cause to assign label and
+	// then delete the message, or in other words cause data loss.
+	// go-imap does not call CreateMessage till it gets the whole message from
+	// IMAP client, therefore with big message, simple wait for APPEND before
+	// performing EXPUNGE is not enough. There has to be two-way lock. Only
+	// that way even if EXPUNGE is called few ms before APPEND and message
+	// is deleted, APPEND will not just assing label but creates the message
+	// again.
+	// The issue is only when moving message from folder which is causing
+	// real removal, so Trash and Spam. Those only need to use the lock to
+	// not cause huge slow down as EXPUNGE is implicitly called also after
+	// UNSELECT, CLOSE, or LOGOUT.
+	appendExpungeLock sync.Mutex
 }

 // newIMAPUser returns struct implementing go-imap/user interface.
@ -218,8 +233,9 @@ func (iu *imapUser) GetQuota(name string) (*imapquota.Status, error) {

 	resources := make(map[string][2]uint32)
 	var list [2]uint32
-	list[0] = uint32(usedSpace / 1000)
-	list[1] = uint32(maxSpace / 1000)
+	// Quota is "in units of 1024 octets" (or KB) and PM returns bytes.
+	list[0] = uint32(usedSpace / 1024)
+	list[1] = uint32(maxSpace / 1024)
 	resources[imapquota.ResourceStorage] = list
 	status := &imapquota.Status{
 		Name:      "",
@ -250,15 +266,3 @@ func (iu *imapUser) CreateMessageLimit() *uint32 {
 	upload := uint32(maxUpload)
 	return &upload
 }
-
-func (iu *imapUser) appendStarted() {
-	iu.appendInProcess.Add(1)
-}
-
-func (iu *imapUser) appendFinished() {
-	iu.appendInProcess.Done()
-}
-
-func (iu *imapUser) waitForAppend() {
-	iu.appendInProcess.Wait()
-}
--- a/internal/importexport/credits.go
+++ b/internal/importexport/credits.go
@ -1,22 +0,0 @@
-// Copyright (c) 2021 Proton Technologies AG
-//
-// This file is part of ProtonMail Bridge.
-//
-// ProtonMail Bridge is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// ProtonMail Bridge is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
-
-// Code generated by ./credits.sh at Mon Feb 1 10:34:22 CET 2021. DO NOT EDIT.
-
-package importexport
-
-const Credits = "github.com/0xAX/notificator;github.com/Masterminds/semver/v3;github.com/ProtonMail/bcrypt;github.com/ProtonMail/crypto;github.com/ProtonMail/docker-credential-helpers;github.com/ProtonMail/go-autostart;github.com/ProtonMail/go-imap;github.com/ProtonMail/go-imap-id;github.com/ProtonMail/go-rfc5322;github.com/ProtonMail/go-vcard;github.com/ProtonMail/gopenpgp/v2;github.com/PuerkitoBio/goquery;github.com/abiosoft/ishell;github.com/abiosoft/readline;github.com/allan-simon/go-singleinstance;github.com/chzyer/logex;github.com/chzyer/test;github.com/cucumber/godog;github.com/docker/docker-credential-helpers;github.com/emersion/go-imap;github.com/emersion/go-imap-appendlimit;github.com/emersion/go-imap-idle;github.com/emersion/go-imap-move;github.com/emersion/go-imap-quota;github.com/emersion/go-imap-unselect;github.com/emersion/go-mbox;github.com/emersion/go-message;github.com/emersion/go-sasl;github.com/emersion/go-smtp;github.com/emersion/go-textwrapper;github.com/emersion/go-vcard;github.com/fatih/color;github.com/flynn-archive/go-shlex;github.com/getsentry/sentry-go;github.com/go-resty/resty/v2;github.com/golang/mock;github.com/google/go-cmp;github.com/google/uuid;github.com/gopherjs/gopherjs;github.com/hashicorp/go-multierror;github.com/jameskeane/bcrypt;github.com/jaytaylor/html2text;github.com/keybase/go-keychain;github.com/logrusorgru/aurora;github.com/mattn/go-runewidth;github.com/miekg/dns;github.com/nsf/jsondiff;github.com/olekukonko/tablewriter;github.com/pkg/errors;github.com/sirupsen/logrus;github.com/skratchdot/open-golang;github.com/ssor/bom;github.com/stretchr/testify;github.com/therecipe/qt;github.com/urfave/cli/v2;github.com/vmihailenco/msgpack/v5;go.etcd.io/bbolt;golang.org/x/crypto;golang.org/x/net;golang.org/x/text;;Font Awesome 4.7.0;;Qt 5.13 by Qt group;"
--- a/internal/sentry/reporter.go
+++ b/internal/sentry/reporter.go
@ -45,28 +45,21 @@ func init() { // nolint[noinit]
 	})
 }

-type userAgentProvider interface {
-	GetUserAgent() string
-}
-
 type Reporter struct {
 	appName    string
 	appVersion string
-	uap        userAgentProvider
+	userAgent  fmt.Stringer
 }

 // NewReporter creates new sentry reporter with appName and appVersion to report.
-func NewReporter(appName, appVersion string) *Reporter {
+func NewReporter(appName, appVersion string, userAgent fmt.Stringer) *Reporter {
 	return &Reporter{
 		appName:    appName,
 		appVersion: appVersion,
+		userAgent:  userAgent,
 	}
 }

-func (r *Reporter) SetUserAgentProvider(uap userAgentProvider) {
-	r.uap = uap
-}
-
 func (r *Reporter) ReportException(i interface{}) error {
 	err := fmt.Errorf("recover: %v", i)

@ -97,19 +90,11 @@ func (r *Reporter) scopedReport(doReport func()) error {
 		return nil
 	}

-	// In case clientManager is not yet created we can get at least OS string.
-	var userAgent string
-	if r.uap != nil {
-		userAgent = r.uap.GetUserAgent()
-	} else {
-		userAgent = runtime.GOOS
-	}
-
 	tags := map[string]string{
 		"OS":        runtime.GOOS,
 		"Client":    r.appName,
 		"Version":   r.appVersion,
-		"UserAgent": userAgent,
+		"UserAgent": r.userAgent.String(),
 		"UserID":    "",
 	}

--- a/internal/sentry/reporter_test.go
+++ b/internal/sentry/reporter_test.go
@ -35,8 +35,8 @@ func TestSkipDuringUnwind(t *testing.T) {
 	}()

 	wantSkippedFunctions := []string{
-		"github.com/ProtonMail/proton-bridge/pkg/sentry.TestSkipDuringUnwind",
-		"github.com/ProtonMail/proton-bridge/pkg/sentry.TestSkipDuringUnwind.func1",
+		"github.com/ProtonMail/proton-bridge/internal/sentry.TestSkipDuringUnwind",
+		"github.com/ProtonMail/proton-bridge/internal/sentry.TestSkipDuringUnwind.func1",
 	}
 	r.Equal(t, wantSkippedFunctions, skippedFunctions)
 }
@ -45,8 +45,8 @@ func TestFilterOutPanicHandlers(t *testing.T) {
 	skippedFunctions = []string{
 		"github.com/ProtonMail/proton-bridge/pkg/config.(*PanicHandler).HandlePanic",
 		"github.com/ProtonMail/proton-bridge/pkg/config.HandlePanic",
-		"github.com/ProtonMail/proton-bridge/pkg/sentry.ReportSentryCrash",
-		"github.com/ProtonMail/proton-bridge/pkg/sentry.ReportSentryCrash.func1",
+		"github.com/ProtonMail/proton-bridge/internal/sentry.ReportSentryCrash",
+		"github.com/ProtonMail/proton-bridge/internal/sentry.ReportSentryCrash.func1",
 	}

 	frames := []sentry.Frame{
@ -57,8 +57,8 @@ func TestFilterOutPanicHandlers(t *testing.T) {
 		{Module: "main", Function: "run"},
 		{Module: "github.com/ProtonMail/proton-bridge/pkg/config", Function: "(*PanicHandler).HandlePanic"},
 		{Module: "github.com/ProtonMail/proton-bridge/pkg/config", Function: "HandlePanic"},
-		{Module: "github.com/ProtonMail/proton-bridge/pkg/sentry", Function: "ReportSentryCrash"},
-		{Module: "github.com/ProtonMail/proton-bridge/pkg/sentry", Function: "ReportSentryCrash.func1"},
+		{Module: "github.com/ProtonMail/proton-bridge/internal/sentry", Function: "ReportSentryCrash"},
+		{Module: "github.com/ProtonMail/proton-bridge/internal/sentry", Function: "ReportSentryCrash.func1"},
 	}

 	gotFrames := filterOutPanicHandlers(frames)
--- a/internal/smtp/dump_default.go
+++ b/internal/smtp/dump_default.go
@ -0,0 +1,22 @@
+// Copyright (c) 2021 Proton Technologies AG
+//
+// This file is part of ProtonMail Bridge.
+//
+// ProtonMail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// ProtonMail Bridge is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
+
+// +build !build_qa
+
+package smtp
+
+func dumpMessageData([]byte, string) {}
--- a/internal/smtp/dump_qa.go
+++ b/internal/smtp/dump_qa.go
@ -0,0 +1,60 @@
+// Copyright (c) 2021 Proton Technologies AG
+//
+// This file is part of ProtonMail Bridge.
+//
+// ProtonMail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// ProtonMail Bridge is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
+
+// +build build_qa
+
+package smtp
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"time"
+
+	"github.com/sirupsen/logrus"
+)
+
+func dumpMessageData(b []byte, subject string) {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		logrus.WithError(err).Error("Failed to dump raw message data")
+		return
+	}
+
+	path := filepath.Join(home, "bridge-qa")
+
+	if err := os.MkdirAll(path, 0700); err != nil {
+		logrus.WithError(err).Error("Failed to dump raw message data")
+		return
+	}
+
+	if len(subject) > 16 {
+		subject = subject[:16]
+	}
+
+	if err := ioutil.WriteFile(
+		filepath.Join(path, fmt.Sprintf("%v-%v.eml", subject, time.Now().Format(time.RFC3339Nano))),
+		b,
+		0600,
+	); err != nil {
+		logrus.WithError(err).Error("Failed to dump raw message data")
+		return
+	}
+
+	logrus.WithField("path", path).Info("Dumped raw message data")
+}
--- a/internal/smtp/user.go
+++ b/internal/smtp/user.go
@ -215,6 +215,10 @@ func (su *smtpUser) Send(returnPath string, to []string, messageReader io.Reader
 	// Called from go-smtp in goroutines - we need to handle panics for each function.
 	defer su.panicHandler.HandlePanic()

+	b := new(bytes.Buffer)
+
+	messageReader = io.TeeReader(messageReader, b)
+
 	mailSettings, err := su.client().GetMailSettings()
 	if err != nil {
 		return err
@ -405,6 +409,8 @@ func (su *smtpUser) Send(returnPath string, to []string, messageReader io.Reader

 	req.PreparePackages()

+	dumpMessageData(b.Bytes(), message.Subject)
+
 	return su.storeUser.SendMessage(message.ID, req)
 }

--- a/internal/store/event_loop.go
+++ b/internal/store/event_loop.go
@ -28,8 +28,13 @@ import (
 	"github.com/sirupsen/logrus"
 )

-const pollInterval = 30 * time.Second
-const pollIntervalSpread = 5 * time.Second
+const (
+	pollInterval       = 30 * time.Second
+	pollIntervalSpread = 5 * time.Second
+
+	// errMaxSentry defines after how many errors in a row to report it to sentry.
+	errMaxSentry = 20
+)

 type eventLoop struct {
 	cache          *Cache
@ -41,6 +46,7 @@ type eventLoop struct {
 	isRunning      bool // The whole event loop is running.

 	pollCounter int
+	errCounter  int

 	log *logrus.Entry

@ -227,9 +233,18 @@ func (loop *eventLoop) processNextEvent() (more bool, err error) { // nolint[fun

 		_, errUnauthorized := errors.Cause(err).(*pmapi.ErrUnauthorized)

+		if err == nil {
+			loop.errCounter = 0
+		}
 		// All errors except Invalid Token (which is not possible to recover from) are ignored.
 		if err != nil && !errUnauthorized && errors.Cause(err) != pmapi.ErrInvalidToken {
-			l.WithError(err).Error("Error skipped")
+			l.WithError(err).WithField("errors", loop.errCounter).Error("Error skipped")
+			loop.errCounter++
+			if loop.errCounter == errMaxSentry {
+				if sentryErr := loop.store.sentryReporter.ReportMessage("Warning: event loop issues: " + err.Error() + ", " + loop.currentEventID); sentryErr != nil {
+					l.WithError(sentryErr).Error("Failed to report error to sentry")
+				}
+			}
 			err = nil
 		}
 	}()
@ -283,6 +298,10 @@ func (loop *eventLoop) processEvent(event *pmapi.Event) (err error) {
 		eventLog.Info("Processing refresh event")
 		loop.store.triggerSync()

+		if sentryErr := loop.store.sentryReporter.ReportMessage("Warning: refresh occurred, " + loop.currentEventID); sentryErr != nil {
+			loop.log.WithError(sentryErr).Error("Failed to report refresh to sentry")
+		}
+
 		return
 	}

--- a/internal/store/store.go
+++ b/internal/store/store.go
@ -24,6 +24,7 @@ import (
 	"sync"
 	"time"

+	"github.com/ProtonMail/proton-bridge/internal/sentry"
 	"github.com/ProtonMail/proton-bridge/pkg/listener"
 	"github.com/ProtonMail/proton-bridge/pkg/pmapi"
 	"github.com/hashicorp/go-multierror"
@ -95,6 +96,7 @@ var (

 // Store is local user storage, which handles the synchronization between IMAP and PM API.
 type Store struct {
+	sentryReporter *sentry.Reporter
 	panicHandler   PanicHandler
 	eventLoop      *eventLoop
 	user           BridgeUser
@ -115,7 +117,8 @@ type Store struct {
 }

 // New creates or opens a store for the given `user`.
-func New(
+func New( // nolint[funlen]
+	sentryReporter *sentry.Reporter,
 	panicHandler PanicHandler,
 	user BridgeUser,
 	clientManager ClientManager,
@ -145,6 +148,7 @@ func New(
 	}

 	store = &Store{
+		sentryReporter: sentryReporter,
 		panicHandler:   panicHandler,
 		clientManager:  clientManager,
 		user:           user,
--- a/internal/store/store_test.go
+++ b/internal/store/store_test.go
@ -125,6 +125,7 @@ func (mocks *mocksForStore) newStoreNoEvents(combinedMode bool, msgs ...*pmapi.M

 	var err error
 	mocks.store, err = New(
+		nil, // Sentry reporter is not used under unit tests.
 		mocks.panicHandler,
 		mocks.user,
 		mocks.clientManager,
--- a/internal/users/mocks/mocks.go
+++ b/internal/users/mocks/mocks.go
@ -188,18 +188,6 @@ func (mr *MockClientManagerMockRecorder) GetClient(arg0 interface{}) *gomock.Cal
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetClient", reflect.TypeOf((*MockClientManager)(nil).GetClient), arg0)
 }

-// SetUserAgent mocks base method
-func (m *MockClientManager) SetUserAgent(arg0, arg1, arg2 string) {
-	m.ctrl.T.Helper()
-	m.ctrl.Call(m, "SetUserAgent", arg0, arg1, arg2)
-}
-
-// SetUserAgent indicates an expected call of SetUserAgent
-func (mr *MockClientManagerMockRecorder) SetUserAgent(arg0, arg1, arg2 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "SetUserAgent", reflect.TypeOf((*MockClientManager)(nil).SetUserAgent), arg0, arg1, arg2)
-}
-
 // MockCredentialsStorer is a mock of CredentialsStorer interface
 type MockCredentialsStorer struct {
 	ctrl     *gomock.Controller
--- a/internal/users/types.go
+++ b/internal/users/types.go
@ -55,7 +55,6 @@ type ClientManager interface {
 	DisallowProxy()
 	GetAuthUpdateChannel() chan pmapi.ClientAuth
 	CheckConnection() error
-	SetUserAgent(clientName, clientVersion, os string)
 }

 type StoreMaker interface {
--- a/internal/users/users_test.go
+++ b/internal/users/users_test.go
@ -26,6 +26,7 @@ import (
 	"time"

 	"github.com/ProtonMail/proton-bridge/internal/events"
+	"github.com/ProtonMail/proton-bridge/internal/sentry"
 	"github.com/ProtonMail/proton-bridge/internal/store"
 	"github.com/ProtonMail/proton-bridge/internal/users/credentials"
 	usersmocks "github.com/ProtonMail/proton-bridge/internal/users/mocks"
@ -185,9 +186,10 @@ func initMocks(t *testing.T) mocks {

 	// Set up store factory.
 	m.storeMaker.EXPECT().New(gomock.Any()).DoAndReturn(func(user store.BridgeUser) (*store.Store, error) {
+		var sentryReporter *sentry.Reporter // Sentry reporter is not used under unit tests.
 		dbFile, err := ioutil.TempFile("", "bridge-store-db-*.db")
 		require.NoError(t, err, "could not get temporary file for store db")
-		return store.New(m.PanicHandler, user, m.clientManager, m.eventListener, dbFile.Name(), m.storeCache)
+		return store.New(sentryReporter, m.PanicHandler, user, m.clientManager, m.eventListener, dbFile.Name(), m.storeCache)
 	}).AnyTimes()
 	m.storeMaker.EXPECT().Remove(gomock.Any()).AnyTimes()

--- a/pkg/keychain/helper_linux.go
+++ b/pkg/keychain/helper_linux.go
@ -19,10 +19,12 @@ package keychain

 import (
 	"os/exec"
+	"reflect"

 	"github.com/docker/docker-credential-helpers/credentials"
 	"github.com/docker/docker-credential-helpers/pass"
 	"github.com/docker/docker-credential-helpers/secretservice"
+	"github.com/sirupsen/logrus"
 )

 const (
@ -43,9 +45,9 @@ func init() { // nolint[noinit]

 	// If Pass is available, use it by default.
 	// Otherwise, if GnomeKeyring is available, use it by default.
-	if _, ok := Helpers[Pass]; ok {
+	if _, ok := Helpers[Pass]; ok && isUsable(newPassHelper("")) {
 		defaultHelper = Pass
-	} else if _, ok := Helpers[GnomeKeyring]; ok {
+	} else if _, ok := Helpers[GnomeKeyring]; ok && isUsable(newGnomeKeyringHelper("")) {
 		defaultHelper = GnomeKeyring
 	}
 }
@ -57,3 +59,36 @@ func newPassHelper(string) (credentials.Helper, error) {
 func newGnomeKeyringHelper(string) (credentials.Helper, error) {
 	return &secretservice.Secretservice{}, nil
 }
+
+// isUsable returns whether the credentials helper is usable.
+func isUsable(helper credentials.Helper, err error) bool {
+	l := logrus.WithField("helper", reflect.TypeOf(helper))
+
+	if err != nil {
+		l.WithError(err).Warn("Keychain helper couldn't be created")
+		return false
+	}
+
+	creds := &credentials.Credentials{
+		ServerURL: "bridge/check",
+		Username:  "check",
+		Secret:    "check",
+	}
+
+	if err := helper.Add(creds); err != nil {
+		l.WithError(err).Warn("Failed to add test credentials to keychain")
+		return false
+	}
+
+	if _, _, err := helper.Get(creds.ServerURL); err != nil {
+		l.WithError(err).Warn("Failed to get test credentials from keychain")
+		return false
+	}
+
+	if err := helper.Delete(creds.ServerURL); err != nil {
+		l.WithError(err).Warn("Failed to delete test credentials from keychain")
+		return false
+	}
+
+	return true
+}
--- a/pkg/pmapi/client.go
+++ b/pkg/pmapi/client.go
@ -78,13 +78,6 @@ type ClientConfig struct {
 	// The client application name and version.
 	AppVersion string

-	// The client application user agent in format `client name/client version (os)`, e.g.:
-	// (Intel Mac OS X 10_15_3)
-	// Mac OS X Mail/13.0 (3608.60.0.2.5) (Intel Mac OS X 10_15_3)
-	// Thunderbird/1.5.0 (Ubuntu 18.04.4 LTS)
-	// MSOffice 12 (Windows 10 (10.0))
-	UserAgent string
-
 	// The client ID.
 	ClientID string

@ -236,7 +229,7 @@ func (c *client) Do(req *http.Request, retryUnauthorized bool) (res *http.Respon
 func (c *client) doBuffered(req *http.Request, bodyBuffer []byte, retryUnauthorized bool) (res *http.Response, err error) { // nolint[funlen]
 	isAuthReq := strings.Contains(req.URL.Path, "/auth")

-	req.Header.Set("User-Agent", c.cm.config.UserAgent)
+	req.Header.Set("User-Agent", c.cm.userAgent.String())
 	req.Header.Set("x-pm-appversion", c.cm.config.AppVersion)

 	if c.uid != "" {
@ -455,18 +448,22 @@ func (c *client) readAllMinSpeed(data io.Reader, cancelRequest context.CancelFun
 	})

 	// speedCheckSeconds controls how often we check the transfer speed.
-	const speedCheckSeconds = 3
+	// Note that connection can be unstable, on average very fast, but can be
+	// idle for few seconds; or that API can take its time before sending
+	// another data, e.g., API can send some data and take some time before
+	// processing and sending the rest of the response.
+	const speedCheckSeconds = 30

 	var buffer bytes.Buffer
 	for {
 		_, err := io.CopyN(&buffer, data, c.cm.config.MinBytesPerSecond*speedCheckSeconds)
 		timer.Stop()
-		timer.Reset(speedCheckSeconds * time.Second)
 		if err == io.EOF {
 			break
 		} else if err != nil {
 			return nil, err
 		}
+		timer.Reset(speedCheckSeconds * time.Second)
 	}

 	return ioutil.ReadAll(&buffer)
--- a/pkg/pmapi/client_test.go
+++ b/pkg/pmapi/client_test.go
@ -172,7 +172,7 @@ func TestClient_FirstReadTimeout(t *testing.T) {

 func TestClient_MinSpeedTimeout(t *testing.T) {
 	finish, c := newTestServerCallbacks(t,
-		routeSlow(4*time.Second), // 1 second longer than the minimum transfer speed poll time.
+		routeSlow(31*time.Second), // 1 second longer than the minimum transfer speed poll time.
 	)
 	defer finish()

--- a/pkg/pmapi/clientmanager.go
+++ b/pkg/pmapi/clientmanager.go
@ -24,6 +24,7 @@ import (
 	"sync"
 	"time"

+	"github.com/ProtonMail/proton-bridge/internal/config/useragent"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 )
@ -37,6 +38,7 @@ type ClientManager struct { //nolint[maligned]
 	newClient func(userID string) Client

 	config       *ClientConfig
+	userAgent    *useragent.UserAgent
 	roundTripper http.RoundTripper

 	clients       map[string]Client
@ -86,9 +88,10 @@ type tokenExpiration struct {
 }

 // NewClientManager creates a new ClientMan which manages clients configured with the given client config.
-func NewClientManager(config *ClientConfig) (cm *ClientManager) {
+func NewClientManager(config *ClientConfig, userAgent *useragent.UserAgent) (cm *ClientManager) {
 	cm = &ClientManager{
 		config:       config,
+		userAgent:    userAgent,
 		roundTripper: http.DefaultTransport,

 		clients:       make(map[string]Client),
@ -118,7 +121,6 @@ func NewClientManager(config *ClientConfig) (cm *ClientManager) {
 	cm.newClient = func(userID string) Client {
 		return newClient(cm, userID)
 	}
-	cm.SetUserAgent("", "", "") // Set default user agent.

 	go cm.watchTokenExpirations()

@ -169,16 +171,12 @@ func (cm *ClientManager) SetRoundTripper(rt http.RoundTripper) {
 	cm.roundTripper = rt
 }

-func (cm *ClientManager) GetClientConfig() *ClientConfig {
-	return cm.config
-}
-
-func (cm *ClientManager) SetUserAgent(clientName, clientVersion, os string) {
-	cm.config.UserAgent = formatUserAgent(clientName, clientVersion, os)
+func (cm *ClientManager) GetAppVersion() string {
+	return cm.config.AppVersion
 }

 func (cm *ClientManager) GetUserAgent() string {
-	return cm.config.UserAgent
+	return cm.userAgent.String()
 }

 // GetClient returns a client for the given userID.
--- a/pkg/pmapi/clientmanager_test.go
+++ b/pkg/pmapi/clientmanager_test.go
@ -17,8 +17,10 @@

 package pmapi

+import "github.com/ProtonMail/proton-bridge/internal/config/useragent"
+
 func newTestClientManager(cfg *ClientConfig) *ClientManager {
-	cm := NewClientManager(cfg)
+	cm := NewClientManager(cfg, useragent.New())

 	go func() {
 		for range cm.authUpdates {
--- a/pkg/pmapi/pin_checker.go
+++ b/pkg/pmapi/pin_checker.go
@ -75,17 +75,18 @@ func certFingerprint(cert *x509.Certificate) string {
 	return fmt.Sprintf(`pin-sha256=%q`, base64.StdEncoding.EncodeToString(hash[:]))
 }

-type clientConfigProvider interface {
-	GetClientConfig() *ClientConfig
+type clientInfoProvider interface {
+	GetAppVersion() string
+	GetUserAgent() string
 }

 type tlsReporter struct {
-	cm          clientConfigProvider
+	cm          clientInfoProvider
 	p           *pinChecker
 	sentReports []sentReport
 }

-func newTLSReporter(p *pinChecker, cm clientConfigProvider) *tlsReporter {
+func newTLSReporter(p *pinChecker, cm clientInfoProvider) *tlsReporter {
 	return &tlsReporter{
 		cm: cm,
 		p:  p,
@ -102,13 +103,14 @@ func (r *tlsReporter) reportCertIssue(remoteURI, host, port string, connState tl
 		certChain = marshalCert7468(connState.PeerCertificates)
 	}

-	cfg := r.cm.GetClientConfig()
+	appVersion := r.cm.GetAppVersion()
+	userAgent := r.cm.GetUserAgent()

-	report := newTLSReport(host, port, connState.ServerName, certChain, r.p.trustedPins, cfg.AppVersion)
+	report := newTLSReport(host, port, connState.ServerName, certChain, r.p.trustedPins, appVersion)

 	if !r.hasRecentlySentReport(report) {
 		r.recordReport(report)
-		go report.sendReport(remoteURI, cfg.UserAgent)
+		go report.sendReport(remoteURI, userAgent)
 	}
 }

--- a/pkg/pmapi/pin_checker_test.go
+++ b/pkg/pmapi/pin_checker_test.go
@ -27,12 +27,16 @@ import (
 	"github.com/stretchr/testify/assert"
 )

-type fakeClientConfigProvider struct {
+type fakeClientInfoProvider struct {
 	version, useragent string
 }

-func (c *fakeClientConfigProvider) GetClientConfig() *ClientConfig {
-	return &ClientConfig{AppVersion: c.version, UserAgent: c.useragent}
+func (c *fakeClientInfoProvider) GetAppVersion() string {
+	return c.version
+}
+
+func (c *fakeClientInfoProvider) GetUserAgent() string {
+	return c.useragent
 }

 func TestPinCheckerDoubleReport(t *testing.T) {
@ -42,7 +46,7 @@ func TestPinCheckerDoubleReport(t *testing.T) {
 		reportCounter++
 	}))

-	r := newTLSReporter(newPinChecker(TrustedAPIPins), &fakeClientConfigProvider{version: "3", useragent: "useragent"})
+	r := newTLSReporter(newPinChecker(TrustedAPIPins), &fakeClientInfoProvider{version: "3", useragent: "useragent"})

 	// Report the same issue many times.
 	for i := 0; i < 10; i++ {
--- a/pkg/pmapi/useragent_test.go
+++ b/pkg/pmapi/useragent_test.go
@ -1,55 +0,0 @@
-// Copyright (c) 2021 Proton Technologies AG
-//
-// This file is part of ProtonMail Bridge.
-//
-// ProtonMail Bridge is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// ProtonMail Bridge is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
-
-package pmapi
-
-import (
-	"runtime"
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-)
-
-func TestUpdateCurrentUserAgentGOOS(t *testing.T) {
-	userAgent := formatUserAgent("", "", "")
-	assert.Equal(t, " ("+runtime.GOOS+")", userAgent)
-}
-
-func TestUpdateCurrentUserAgentOS(t *testing.T) {
-	userAgent := formatUserAgent("", "", "os")
-	assert.Equal(t, " (os)", userAgent)
-}
-
-func TestUpdateCurrentUserAgentClientVer(t *testing.T) {
-	userAgent := formatUserAgent("", "ver", "os")
-	assert.Equal(t, " (os)", userAgent)
-}
-
-func TestUpdateCurrentUserAgentClientName(t *testing.T) {
-	userAgent := formatUserAgent("mail", "", "os")
-	assert.Equal(t, "mail (os)", userAgent)
-}
-
-func TestUpdateCurrentUserAgentClientNameAndVersion(t *testing.T) {
-	userAgent := formatUserAgent("mail", "ver", "os")
-	assert.Equal(t, "mail/ver (os)", userAgent)
-}
-
-func TestRemoveBrackets(t *testing.T) {
-	userAgent := formatUserAgent("mail (submail)", "ver (subver)", "os (subos)")
-	assert.Equal(t, "mail-submail/ver-subver (os subos)", userAgent)
-}
--- a/release-notes/bridge_early.md
+++ b/release-notes/bridge_early.md
@ -1,3 +1,37 @@
+## v1.6.5
+- 2021-02-22
+
+### New
+
+- Allow to choose which keychain is used by Bridge on Linux
+- Added automatic update CLI commands
+- Improved performance during slow connection
+- Added IMAP requests to the logs for easier debugging 
+
+### Fixed
+
+- NoGUI bulid
+- Background of GUI welcome message
+- Incorrect total mailbox size displayed in Apple Mail
+
+## v1.6.3
+- 2021-02-16
+
+### New
+
+- Added desktop files and icon in Bridge repo
+- Better detection of MacOS version to improve automatic AppleMail configuration
+- Clearing cache after switching early access off
+
+### Fixed
+
+- Better poor connection handling - added retries for starting IMAP server after the connection was down
+- Excluding updates from 'clearing cache'
+- Not allowing copying from Inbox to Sent and vice versa
+- Improvements to moving messages (unlabelling folders)
+- Fixed the separation of release notes for 'early' and 'stable' channels
+
+
 ## v1.6.2
 - 2021-02-02

--- a/release-notes/bridge_stable.md
+++ b/release-notes/bridge_stable.md
@ -1,3 +1,21 @@
+## v1.6.3
+- 2021-02-16
+
+### New
+
+- Added desktop files and icon in Bridge repo
+- Better detection of MacOS version to improve automatic AppleMail configuration
+- Clearing cache after switching early access off
+
+### Fixed
+
+- Better poor connection handling - added retries for starting IMAP server after the connection was down
+- Excluding updates from 'clearing cache'
+- Not allowing copying from Inbox to Sent and vice versa
+- Improvements to moving messages (unlabelling folders)
+- Fixed the separation of release notes for 'early' and 'stable' channels
+
+
 ## v1.6.2
 - 2021-02-02

--- a/test/api_checks_test.go
+++ b/test/api_checks_test.go
@ -41,7 +41,7 @@ func APIChecksFeatureContext(s *godog.Suite) {
 	s.Step(`^API mailbox "([^"]*)" for address "([^"]*)" of "([^"]*)" has (\d+) message(?:s)?$`, apiMailboxForAddressOfUserHasNumberOfMessages)
 	s.Step(`^API mailbox "([^"]*)" for "([^"]*)" has messages$`, apiMailboxForUserHasMessages)
 	s.Step(`^API mailbox "([^"]*)" for address "([^"]*)" of "([^"]*)" has messages$`, apiMailboxForAddressOfUserHasMessages)
-	s.Step(`^API client manager user-agent is "([^"]*)"$`, clientManagerUserAgent)
+	s.Step(`^API user-agent is "([^"]*)"$`, userAgent)
 }

 func apiIsCalled(endpoint string) error {
@ -187,12 +187,11 @@ func getPMAPIMessages(account *accounts.TestAccount, mailboxName string) ([]*pma
 	return ctx.GetPMAPIController().GetMessages(account.Username(), labelID)
 }

-func clientManagerUserAgent(expectedUserAgent string) error {
+func userAgent(expectedUserAgent string) error {
 	expectedUserAgent = strings.ReplaceAll(expectedUserAgent, "[GOOS]", runtime.GOOS)

 	assert.Eventually(ctx.GetTestingT(), func() bool {
-		userAgent := ctx.GetClientManager().GetUserAgent()
-		return userAgent == expectedUserAgent
+		return ctx.GetUserAgent() == expectedUserAgent
 	}, 5*time.Second, time.Second)

 	return nil
--- a/test/context/bridge.go
+++ b/test/context/bridge.go
@ -21,6 +21,9 @@ import (
 	"time"

 	"github.com/ProtonMail/proton-bridge/internal/bridge"
+	"github.com/ProtonMail/proton-bridge/internal/config/useragent"
+	"github.com/ProtonMail/proton-bridge/internal/constants"
+	"github.com/ProtonMail/proton-bridge/internal/sentry"
 	"github.com/ProtonMail/proton-bridge/internal/users"
 	"github.com/ProtonMail/proton-bridge/pkg/listener"
 )
@ -67,8 +70,9 @@ func newBridgeInstance(
 	eventListener listener.Listener,
 	clientManager users.ClientManager,
 ) *bridge.Bridge {
+	sentryReporter := sentry.NewReporter("bridge", constants.Version, useragent.New())
 	panicHandler := &panicHandler{t: t}
 	updater := newFakeUpdater()
 	versioner := newFakeVersioner()
-	return bridge.New(locations, cache, settings, panicHandler, eventListener, clientManager, credStore, updater, versioner)
+	return bridge.New(locations, cache, settings, sentryReporter, panicHandler, eventListener, clientManager, credStore, updater, versioner)
 }
--- a/test/context/context.go
+++ b/test/context/context.go
@ -22,6 +22,7 @@ import (
 	"sync"

 	"github.com/ProtonMail/proton-bridge/internal/bridge"
+	"github.com/ProtonMail/proton-bridge/internal/config/useragent"
 	"github.com/ProtonMail/proton-bridge/internal/constants"
 	"github.com/ProtonMail/proton-bridge/internal/importexport"
 	"github.com/ProtonMail/proton-bridge/internal/transfer"
@ -46,6 +47,7 @@ type TestContext struct {
 	locations    *fakeLocations
 	settings     *fakeSettings
 	listener     listener.Listener
+	userAgent    *useragent.UserAgent
 	testAccounts *accounts.TestAccounts

 	// pmapiController is used to control real or fake pmapi clients.
@ -95,11 +97,12 @@ type TestContext struct {
 func New(app string) *TestContext {
 	setLogrusVerbosityFromEnv()

-	configName := app
-	if app == "ie" {
-		configName = "importExport"
-	}
-	cm := pmapi.NewClientManager(pmapi.GetAPIConfig(configName, constants.Version))
+	userAgent := useragent.New()
+
+	cm := pmapi.NewClientManager(
+		pmapi.GetAPIConfig(getConfigName(app), constants.Version),
+		userAgent,
+	)

 	ctx := &TestContext{
 		t:                     &bddT{},
@ -107,6 +110,7 @@ func New(app string) *TestContext {
 		locations:             newFakeLocations(),
 		settings:              newFakeSettings(),
 		listener:              listener.New(),
+		userAgent:             userAgent,
 		pmapiController:       newPMAPIController(cm),
 		clientManager:         cm,
 		testAccounts:          newTestAccounts(),
@ -137,6 +141,14 @@ func New(app string) *TestContext {
 	return ctx
 }

+func getConfigName(app string) string {
+	if app == "ie" {
+		return "importExport"
+	}
+
+	return app
+}
+
 // Cleanup runs through all cleanup steps.
 // This can be a deferred call so that it is run even if the test steps failed the test.
 func (ctx *TestContext) Cleanup() *TestContext {
@ -156,6 +168,11 @@ func (ctx *TestContext) GetClientManager() *pmapi.ClientManager {
 	return ctx.clientManager
 }

+// GetUserAgent returns the current user agent.
+func (ctx *TestContext) GetUserAgent() string {
+	return ctx.userAgent.String()
+}
+
 // GetTestingT returns testing.T compatible struct.
 func (ctx *TestContext) GetTestingT() *bddT { //nolint[golint]
 	return ctx.t
--- a/test/context/imap.go
+++ b/test/context/imap.go
@ -59,7 +59,7 @@ func (ctx *TestContext) withIMAPServer() {
 	tls, _ := tls.New(settingsPath).GetConfig()

 	backend := imap.NewIMAPBackend(ph, ctx.listener, ctx.cache, ctx.bridge)
-	server := imap.NewIMAPServer(ph, true, true, port, tls, backend, ctx.listener)
+	server := imap.NewIMAPServer(ph, true, true, port, tls, backend, ctx.userAgent, ctx.listener)

 	go server.ListenAndServe()
 	require.NoError(ctx.t, waitForPort(port, 5*time.Second))
--- a/test/features/bridge/imap/user_agent.feature
+++ b/test/features/bridge/imap/user_agent.feature
@ -4,21 +4,23 @@ Feature: User agent

  Scenario: Get user agent
    Given there is IMAP client logged in as "user"
+    Then API user-agent is "UnknownClient/0.0.1 ([GOOS])"
    When IMAP client sends ID with argument:
    """
    "name" "Foo" "version" "1.4.0"
    """
-    Then API client manager user-agent is "Foo/1.4.0 ([GOOS])"
+    Then API user-agent is "Foo/1.4.0 ([GOOS])"

  Scenario: Update user agent
    Given there is IMAP client logged in as "user"
+    Then API user-agent is "UnknownClient/0.0.1 ([GOOS])"
    When IMAP client sends ID with argument:
    """
    "name" "Foo" "version" "1.4.0"
    """
-    Then API client manager user-agent is "Foo/1.4.0 ([GOOS])"
+    Then API user-agent is "Foo/1.4.0 ([GOOS])"
    When IMAP client sends ID with argument:
    """
    "name" "Bar" "version" "4.2.0"
    """
-    Then API client manager user-agent is "Bar/4.2.0 ([GOOS])"
+    Then API user-agent is "Bar/4.2.0 ([GOOS])"
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Jakub	199a4d1e3a	Other: Release Bridge HZM 1.6.6	2021-02-25 16:28:17 +01:00
Alexander Bilyak	18668aafc9	GODT-1029: Fix tray icon not updating under certain conditions	2021-02-25 14:53:43 +00:00
Alexander Bilyak	fd73ec6861	GODT-1062: Fix lost notification bar when window is closed	2021-02-25 14:53:43 +00:00
Michal Horejsek	feeb7179f5	GODT-1058 Install after chaning channel right away only in case of downgrade	2021-02-25 14:47:12 +00:00
Jakub	0e5a45671f	GODT-1073 Added: Re-write autostart link on every start if turned on in preferences.	2021-02-24 19:32:59 +00:00
Jakub	2beb0d298e	Other: QA build checks for update every 5 minutes	2021-02-24 20:34:13 +01:00
James Houlahan	22a6fcd87f	Other: add debug message dump when sending	2021-02-23 10:38:15 +00:00
Michal Horejsek	f499252444	GODT-1055 Fix flaky empty trash test	2021-02-23 08:37:07 +00:00
Jakub	b27e3fdb28	Merge release/hzm in devel	2021-02-22 17:36:31 +01:00
Andrzej Szafranski	415e56d928	Other Update bridge_early.md	2021-02-22 15:42:30 +01:00
Alexander Bilyak	845074f421	Other: Bridge HZM 1.6.5	2021-02-19 13:00:01 +01:00
James Houlahan	28f46deef9	Other: only choose pass if usable	2021-02-18 13:23:38 +01:00
James Houlahan	2a078b76e6	GODT-1045 build without Qt by default	2021-02-18 09:45:18 +00:00
Jakub	3428557b15	Other: Bridge HZM 1.6.4	2021-02-17 14:17:11 +01:00
James Houlahan	1f25aeab31	GODT-980: placeholder for user agent	2021-02-17 13:49:51 +01:00
Michal Horejsek	4e531d4524	GODT-1036 Event loop Sentry reporting of failures and refresh	2021-02-17 09:17:19 +00:00
Jakub	7fc7083c76	GODT-957 Increase space to hide difference	2021-02-17 08:37:12 +00:00
Alexander Bilyak	0fe69d9de1	GODT-937: Add keychain switcher to frontend GODT-1008: Fix transparent dialog under certain conditions	2021-02-17 07:35:59 +00:00
Michal Horejsek	8b436186a4	GODT-1034 More tolerant connection speed detection	2021-02-17 06:13:15 +00:00
Michal Horejsek	4d000c2376	GODT-1018 Pre-push git hook to check lints	2021-02-17 05:10:42 +00:00
Alexander Bilyak	56bce8e06f	Other: Make all command line flags as const strings	2021-02-16 22:01:50 +00:00
Jakub	6fd614595d	Other: 1.6.3 release notes update	2021-02-16 19:39:43 +01:00
Michal Horejsek	7bb7e1a518	GODT-1041 Log IMAP requests to debug Apple Mail re-sync issue	2021-02-16 14:15:37 +00:00
James Houlahan	fb89fb7b31	Other: pretty print prefs.json	2021-02-15 11:31:42 +01:00
Michal Horejsek	e6ae344f1f	GODT-797 APPEND waits for EXPUNGE to prevent data loss when Outlook moves from Spam or Trash	2021-02-12 15:33:31 +01:00
James Houlahan	bad8cad97d	Other: fix nogui build	2021-02-12 09:34:10 +01:00
James Houlahan	77cd2955f1	chore: remove credits	2021-02-11 15:10:53 +00:00
James Houlahan	567b65df8d	feat: autoupdates CLI commands	2021-02-11 08:40:51 +00:00
Michal Horejsek	06b3ed9b85	GODT-317 Fix wrong total mailbox size in Apple Mail	2021-02-11 07:29:28 +00:00
Jakub	565c0b6ddf	Fixing changelog punctuation.	2021-02-10 16:09:47 +01:00