[kimap] [Bug 449184] New: Connection fails because the CAPABILITY command is sent before the server greeting arrived

[Fabian Vogt]

https://bugs.kde.org/show_bug.cgi?id=449184

            Bug ID: 449184
           Summary: Connection fails because the CAPABILITY command is
                    sent before the server greeting arrived
           Product: kimap
           Version: git
          Platform: openSUSE RPMs
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: fabian at ritter-vogt.de
  Target Milestone: ---

Since yesterday, IMAP connections to imap.1und1.de fail:

org.kde.pim.kimap: KIMAP::LoginJob(0x564b0931c4d0)
org.kde.pim.kimap: Connecting to IMAP server with no proxy
org.kde.pim.kimap: connectToHost "imap.1und1.de" 993
org.kde.pim.kimap: TLS negotiation done, the negotiated protocol is "TLSv1.3"
C: A000001 CAPABILITY
S: * BYE out-of-sync data before server greeting
org.kde.pim.kimap: Received BYE:  "out-of-sync data before server greeting "
org.kde.pim.kimap: close
org.kde.pim.kimap: close
org.kde.pim.kimap: Connection to server lost 
QAbstractSocket::RemoteHostClosedError
org.kde.pim.kimap: KIMAP::LoginJob(0x564b0931c4d0)

The issue is that LoginJob sends the CAPABILITY command before the server
greeting arrived.

Apparently this also affects some other mail clients:
https://www.batboard.net/thread/15020-bye-out-of-sync-data-before-server-greeting/

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