Merge branch master into devel

internal/store/mailbox_ids.go

@@ -219,6 +219,11 @@ func (storeMailbox *Mailbox) GetUIDByHeader(header *mail.Header) (foundUID uint3
 	// in PM message. Message-Id in normal copy/move will be the PM internal ID.
 	messageID := header.Get("Message-Id")
 
+	// There is nothing to find, when no Message-Id given.
+	if messageID == "" {
+		return uint32(0)
+	}
+
 	// The most often situation is that message is APPENDed after it was sent so the
 	// Message-ID will be reflected by ExternalID in API message meta-data.
 	externalID := strings.Trim(messageID, "<> ") // remove '<>' to improve match

internal/store/mailbox_message.go

@@ -303,7 +303,6 @@ func (storeMailbox *Mailbox) txCreateOrUpdateMessages(tx *bolt.Tx, msgs []*pmapi
 						seqNum,
 						msg,
 					)
-					shouldSendMailboxUpdate = true
 				}
 				continue
 			}

internal/store/user_message_test.go

@@ -80,7 +80,7 @@ func TestCreateOrUpdateMessageMetadata(t *testing.T) {
 	a.Equal(t, []*pmapi.Attachment(nil), msg.Attachments)
 	a.Equal(t, int64(-1), msg.Size)
 	a.Equal(t, "", msg.MIMEType)
-	a.Equal(t, mail.Header(nil), msg.Header)
+	a.Equal(t, make(mail.Header), msg.Header)
 
 	// Change the calculated data.
 	wantSize := int64(42)