[Akonadi] [Bug 316840] New: imap resource starts crazy connect / disconnect cycle to mail server

[Ben]

https://bugs.kde.org/show_bug.cgi?id=316840

            Bug ID: 316840
           Summary: imap resource starts crazy connect / disconnect cycle
                    to mail server
    Classification: Unclassified
           Product: Akonadi
           Version: 1.9.0
          Platform: Ubuntu Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: IMAP resource
          Assignee: ervin at kde.org
          Reporter: ben at hewson-venieri.com
                CC: kdepim-bugs at kde.org, vkrause at kde.org

To all outward appearances the imap connection is fine. 
However after discovering the mail server was filling up its log partion I
discovered the following entries

Mar 16 11:26:12 vmail1 imapd-ssl: Connection, ip=[::ffff:xx.xx.xx.x]
Mar 16 11:26:12 vmail1 imapd-ssl: Disconnected, ip=[::ffff:xx.xx.xx.xx],
time=0, starttls=1
Mar 16 11:26:12 vmail1 imapd-ssl: Connection, ip=[::ffff:xx.xx.xx.xx]
Mar 16 11:26:12 vmail1 imapd-ssl: Disconnected, ip=[::ffff:xx.xx.xx.xx],
time=0, starttls=1
Mar 16 11:26:12 vmail1 imapd-ssl: Connection, ip=[::ffff:xx.xx.xx.xx]
Mar 16 11:26:12 vmail1 imapd-ssl: Disconnected, ip=[::ffff:xx.xx.xx.xx],
time=0, starttls=1

These are repeated at least 8-10 per second (from the same IP address), and
once started, don't seem to stop.
Removing the imap account from akonadi stops these messages.
Using Thunderbird on the same computer to connect to the same server is fine.
The mail server is running courier imap and I have not noticed this happen
before.
It looks like this started after a Kubuntu update - maybe to KDE 4.10.1, but I
can't be sure of this.
This is happening from two different computers, although both are running
Kubuntu KDE 4.10.1


When initially adding an imap account everything is fine. The crazy
connect/disconnects only start after a some minutes.
It doesn't appear to be related to the mail check interval. I have tried with
the default 5 minutes and at 1 minute.
With time interval of 1 minute the craziness starts after approximately  30
minutes. I haven't timed it with a 5 minute check interval, but at a guess it
was around a similar amount of time.

I  have not yet tried with interval mail checking disabled to see if the same
thing happens, or if forcing a mail check from kmail can trigger this sooner.









Reproducible: Always

Steps to Reproduce:
To see this you need access to mail server logs

1. setup an imap account
2. put a tail on mail server logs
3. after approximately 30 minutes, continuous connect/disconnects start

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