[kmail2] [Bug 489601] New: Kmail2 sometimes fails to display a message on an IMAP folder

[Guido Winkelmann]

https://bugs.kde.org/show_bug.cgi?id=489601

            Bug ID: 489601
           Summary: Kmail2 sometimes fails to display a message on an IMAP
                    folder
    Classification: Applications
           Product: kmail2
           Version: 6.1.1
          Platform: Gentoo Packages
                OS: Linux
            Status: REPORTED
          Severity: grave
          Priority: NOR
         Component: message list
          Assignee: kdepim-bugs at kde.org
          Reporter: guido-kdebugs at unknownsite.de
  Target Milestone: ---

SUMMARY

Every once in a while, kmail2 will fail to display an email in my IMAP inbox
that is visible in other email clients (for example Thunderbird or AquaMail on
my smartphone) using that same IMAP account. Right now, I have an important
email in my inbox with an important invoice, which kmail is just not showing to
me. Even if I press F5 repeatedly, the email will not show up. Restarting both
kmail and akonadi (using "akonadi stop" on the command line) does not reveal
the missing email, either.

If I were to rely exclusively on kmail for reading my emails, I would have no
way of even knowing that I have received that mail. That makes this a kind of
silent data loss, which is arguably much more severe for the user than any
crash could ever be, which is why I selected "grave" as the severity.

The IMAP server in question is running Cyrus IMAPd.

In the past, I have had success making kmail see the email in question by
moving it to a different IMAP folder using a different email client. This time
I have not done that, because I don't know how to reproduce the bug
intentionally, and it happens only very rarely (but could have major
consequences when it does), so keeping the problem around for a while might
just be more valuable.

STEPS TO REPRODUCE
Steps to reproduce this bug are not known to me at this time. It happens
randomly.

OBSERVED RESULT
An email that I know to be in my IMAP inbox is not shown.

EXPECTED RESULT
All emails that are present in any of my IMAP folders should always be shown in
the message list for that folder, with no exceptions, ever.

SOFTWARE/OS VERSIONS
Windows: –
macOS: –
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 6.1.1
KDE Frameworks Version:  6.3.0
Qt Version: 6.7.2

ADDITIONAL INFORMATION

The problem is not new by any stretch. It has started turning up every once in
a while ever since kmail switched to using akonadi as a back end.

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