[Akonadi] [Bug 327894] Kmail can not delete emails (imap). Emails are downloaded again after removal.

[Christian Mollekopf]

https://bugs.kde.org/show_bug.cgi?id=327894

Christian Mollekopf <mollekopf at kolabsys.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDSINFO                   |CONFIRMED
         Resolution|WAITINGFORINFO              |---
     Ever confirmed|0                           |1

--- Comment #13 from Christian Mollekopf <mollekopf at kolabsys.com> ---
(In reply to comment #12)
> I could resolve the problem for my setup by replacing the IMAP server. I was
> working with uw-imapd before, but this server can not handle multiple
> simultaneous connections. The kmail log files showed, that kmail and/or
> akonadi open two IMAP connections. Because of the uw-imapd limitation, the
> second one was read-only. This was the reason why kmail was not able to
> delete the messages I moved to trash. After replacing uw-imapd with
> dovecot-imap, everything works perfect.
> 
> May be, this information helps you tracking down the problem in your
> environment.

The imap resource works with a session pool that has a fixed size of 2 (and a
session corresponds to a tcp connection to the server). Typically one session
is used for IDLE and the other for all other requests. If IDLE is not supported
by the server two session are anyways allocated and used.

I'm not sure whether we anyways want to work with multiple session to emulate
pipelining or if we should resize the session pool to 1 if IDLE is not
supported (or even have a dedicated session for IDLE).

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