[Dovecot] Outlook 2007 & 2010 hangs in v2.2?

Nick Edwards nick.z.edwards at gmail.com
Sun Jun 15 11:41:38 UTC 2014

The dude you forced to leave the list last year tweeted about this
problem in February, so it was noticed back then, apparently Noel said
"CBF reporting the issue as the fucker would ignore me anyway, 'n if
he did read it, wld prolly blame my config"

I'll forward your patch and see what he says LOL

On 6/10/14, Timo Sirainen <tss at iki.fi> wrote:
> On 9.6.2014, at 20.49, Andy Dills <andy at xecu.net> wrote:
>>>> Has anybody noticed Outlook 2007 & 2010 (but apparently not 2013)
>>>> hanging IMAP connections with Dovecot v2.2 (but not v2.1) when they're
>>>> FETCHing large mails? I can't think of any reasonable explanation for
>>>> this.
>>> Most likely solved by: http://hg.dovecot.org/dovecot-2.2/rev/6a9508d28d34
>>> [1]
>>> Strange that it didn't break more commonly or that more people weren't
>>> complaining about it.. The bug has been there since v2.2.7.
>> Thank you Timo. This patch did indeed correct the problem, we had no
>> problem doing full syncs with the problematic accounts after
>> implementing this.
>> Is it perhaps something that only happens with directory/proxy
>> environments? I'm surprised it hasn't been mentioned before, I figured
>> it was something particular to our implementation since nobody else was
>> mentioning it, until you did.
>> Fascinating to me that it only affects Outlook as well. I don't
>> understand the code well enough to grasp the impact of the bug, so if
>> somebody has a minute to share an explanation that would be cool.
> Only happened when using Dovecot proxy. Only happened if client sent a
> command while another long running command was already sending data. So
> basically if Outlook started downloading a large mail on background and user
> clicked another mail, the already running FETCH was stopped because Outlook
> sent another FETCH command to the same connection. I guess Outlook was the
> only client to do that.

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