GODT-1779: Remove go-imap

internal/user/errors.go

@@ -0,0 +1,12 @@
+package user
+
+import "errors"
+
+var (
+	ErrNoSuchAddress     = errors.New("no such address")
+	ErrNotImplemented    = errors.New("not implemented")
+	ErrNotSupported      = errors.New("not supported")
+	ErrInvalidReturnPath = errors.New("invalid return path")
+	ErrInvalidRecipient  = errors.New("invalid recipient")
+	ErrMissingAddressKey = errors.New("missing address key")
+)