[Dovecot] lmtp proxy timeout while waiting for reply to DATA reply

[Daniel Parthey]

Timo Sirainen wrote:
> On Sat, 2012-04-28 at 13:00 +0200, Daniel Parthey wrote:
> > we are experiencing similar sporadic data timeout issues with dovecot 2.0.20
> > as in http://dovecot.org/pipermail/dovecot/2011-June/059807.html
> > at least once a week. Some mails get temporarily deferred in the
> > postfix queue since dovecot director lmtp refuses them and the
> > mails are delivered at a later time.
> 
> [...] what isn't in v2.0 is the larger rewrite of the LMTP
> proxying code in v2.1, which I hope fixes also this timeout problem.

This Friday I did about 50 "sendmail -bv" commands in a loop to
check some postfix aliases, which resulted in a lot of mails to
the postmaster alias (which is distributed to about 10 people).

The result was about 11 bounces of the following type:

#####################################################################
Return-Path: <>
Received: from mail01.example.org ([10.129.3.233])
  by mail04.example.org (Dovecot) with LMTP id gl2gG3WyyE+faQAAUavrWA
  ; Fri, 01 Jun 2012 14:15:49 +0200
Return-Path: <>
Received: from mx01.example.org ([127.0.0.1])
  by mail01.example.org (Dovecot) with LMTP id zAL8MXCyyE8nLwAA3l+BKA
  ; Fri, 01 Jun 2012 14:15:49 +0200
RSET
RSET
#####################################################################

At the same time, the dovecot lmtp timeout errors occurred and
not all "sendmail -bv" mails got delivered.

Seems like a serious error and I will need to consider
upgrading to 2.1 if the bug cannot get fixed in 2.0.

Regards
Daniel