[Dovecot] Maybe wrong quota recalculation behaviour on overquota delivery try

[Timo Sirainen]

On Thu, 2010-09-02 at 19:14 +0200, Luca Palazzo wrote:
> 
> Looking at mbox servers log nothing seem to happen, but stracing lmtp 
> process we can see stat system calls to all Maildir files, as if
> dovecot 
> was recalculating quota and regenerating maildirsize file.
> 
> It happens always when LMTP tries to deliver a mail to an overquota
> account.

Yes, that's pretty much how Maildir++ quota works. If maildirsize file
doesn't only contain a single line showing the quota, or if it's older
than 15 minutes, it's recalculated. The maildir filenames really should
have ,S=size in the filenames, otherwise quota recalculation is horribly
slow.

Maybe you should switch to dict quota with file backend.
http://wiki2.dovecot.org/Quota/Dict