https://bugs.kde.org/show_bug.cgi?id=327513

            Bug ID: 327513
           Summary: IMAP server disconnect leads to failure in mail
                    retrieval/corrupt akonadi cache
    Classification: Unclassified
           Product: Akonadi
           Version: 1.10.80
          Platform: Kubuntu Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: grave
          Priority: NOR
         Component: IMAP resource
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected], [email protected]

Our IMAP server (Kolab -> cyrus) is shut down briefly for back-up purposes each
night. When I leave Kontact/KMail running over night, all e-mail accounts will
be offline in the morning.

Very frequently, KMail fails to collect any more new mail in the INBOX of an
account that has been offline. Restarting Kontact/KMail does not change that.
Using "Update Folder" (F5) or "Check Mail" has no effect. Restarting akonadi
also does not help. Also: There is no indication to the user whatsoever that
mail fetching does not work, which causes users to potentially miss important
mail.

Whenever this happens, the only way to get the inbox updated again is to start
akonadiconsole and do a "clear akonadi cache" on that particular inbox, plus
sometimes also restarting Kontact. Obviously, this also deletes all tags, flags
and other information.

Funny enough, this problem only affects the inbox - all mail in subfolders (I
have sieve filters running on the server) is still retrieved, flagged and
displayed correctly.

Given that this bug makes daily mail usage in KMail unreliable, I'll mark this
as "Grave".

Reproducible: Sometimes

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