[Dovecot] imap-login processes

[Timo Sirainen]

On May 16, 2008, at 8:39 PM, Joe Allesi wrote:

>
> "I tried switching to high-performance mode yesterday.. It seemed to  
> end up
> with sort of the same results, though harder to diagnose. Each  
> process I
> guess ended up hitting the login_process_size = 64 max and then  
> stopped
> responding."
>
> We had this same problem, and switching to high-performance mode  
> helps.
> However, finding out which user or application is logging in, and
> controlling the end-user is the only way to fix it. In our case it  
> was a
> multi-threaded application that used IMAP (excessively). Monitoring  
> the
> maillog should help point you in the right direction. Dozens of  
> these per
> minute should throw up a red-flag:
>
> May 16 17:36:16 <hostname> imap-login: Login: <user>  
> [::ffff:<IP_Address>]

v1.1 probably helps with this, since it limits the number of  
simultaneous connections from a user+IP combination.

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