Bug 449134

SUMMARY
For a single (long used) account imap stoped working. If I switch to STARTTLS it works again and stops again if i switch back to SSL/TLS. In other clients and on my phone everything works well with SSL/TLS enabled.

Some lines from the logfile:
[2022-01-25T10:31:15.413Z] akonadi_imap_resource org.kde.pim.kimap KIMAP::LoginJob(0x5638e865d6d0)
[2022-01-25T10:31:15.414Z] akonadi_imap_resource org.kde.pim.kimap KIMAP::LoginJob(0x5638e865de30)
[2022-01-25T10:31:15.414Z] akonadi_imap_resource org.kde.pim.kimap Connecting to IMAP server with no proxy
[2022-01-25T10:31:15.414Z] akonadi_imap_resource org.kde.pim.kimap connectToHost "imap.ionos.de" 993
[2022-01-25T10:31:15.439Z] akonadi_imap_resource org.kde.pim.kimap KIMAP::LoginJob(0x5638e865de30)
[2022-01-25T10:31:15.491Z] akonadi_imap_resource org.kde.pim.kimap TLS negotiation done, the negotiated protocol is "TLSv1.3"
[2022-01-25T10:31:15.586Z] akonadi_imap_resource org.kde.pim.kimap Received BYE:  "out-of-sync data before server greeting "
[2022-01-25T10:31:15.586Z] akonadi_imap_resource org.kde.pim.kimap close
[2022-01-25T10:31:15.586Z] akonadi_imap_resource org.kde.pim.kimap close
[2022-01-25T10:31:15.586Z] akonadi_imap_resource org.kde.pim.imapresource online= false
[2022-01-25T10:31:15.586Z] akonadi_imap_resource org.kde.pim.imapresource online= true
[2022-01-25T10:31:15.586Z] akonadi_imap_resource org.kde.pim.kimap Connection to server lost  QAbstractSocket::RemoteHostClosedError
[2022-01-25T10:31:15.586Z] akonadi_imap_resource org.kde.pim.akonadiagentbase Deferring task "977 Custom startConnect "
[2022-01-25T10:31:15.586Z] akonadi_imap_resource org.kde.pim.imapresource online= false
[2022-01-25T10:31:15.593Z] akonadi_imap_resource org.kde.pim.kimap KIMAP::LoginJob(0x5638e865de30)

Maybe this is related to akonadi. But I don't know how to check that.


STEPS TO REPRODUCE
1.  Switch to SSL/TLS
2.  Switch back to STARTTLS

OBSERVED RESULT
see above

EXPECTED RESULT
no error