[kmail2] [Bug 349860] New: Kmail/Akonadi fills entire harddisk with messages from certain imap accounts

[Andreas]

https://bugs.kde.org/show_bug.cgi?id=349860

            Bug ID: 349860
           Summary: Kmail/Akonadi fills entire harddisk with messages from
                    certain imap accounts
           Product: kmail2
           Version: 4.14.2
          Platform: Kubuntu Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: crash
          Priority: NOR
         Component: misc
          Assignee: kdepim-bugs at kde.org
          Reporter: hohenegger at web.de

I experienced this with kmail when connecting a hotmail.fr imap acount (this
seems to be microsoft essentially) which contains a large number (more than
5000) of messages. The problem was that kmail/akonadi failed when downloading
the messages in a catastrophic way: It would download an even much larger
number of messages (apparently identical messages multiple times) until the
harddisk was completely full with 10s of gigabytes of messages. 

It will probably be hard for someone else to reproduce it but the fix I had for
it may give a hint on where the origin of the problem is:
I first tried to use the command line application isync which can synchronize
an imap directory with a local folder. The result was that it failed as well,
after downloading a few messages it stopped. Then I tried to set
'PipelineDepth' in the configuration file to 100. Then it worked. 

It seems that this imap server (maybe in violation of the protocol) stops
without proper fail state when too many commands are received. Kmail/Akonadi
apparently do not detect this and download in repeated attempts the same
messages again.

Reproducible: Always

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