[Dovecot] Dovecot 2.0.13 problem with LMTP

[Innocenzi, Cinzia]

Hello Timo,

I'm sorry I haven't replied before, but I've been investigating as much as possible on this problem, and, for a moment, I thought I came up with something...

Thanks to Simone Caruso's hint, I've been doing some checks on LMTP-LDAP connections, since I would always get an LDAP error in the dovecot proxy's logfile.

Furthermore, I found out that the back end nodes didn't have resolv.conf aligned properly. So I blamed the errors to this misconfiguration, especially because as soon as I aligned resolv.conf, the three stuck mails I had in the queue this morning got delivered immediately!

Unfortunately, this is not the case.

I applied the three patches you provided to front end proxies and back end nodes.

I have a stuck mail that will not get delivered! I'm attaching the logs.

Thanks again for your help.

Regards,


CINZIA INNOCENZI
Technical Consulting
HP Enterprise Services
Telephone +39 06.6542.5758
Email cinzia.innocenzi at hp.com   
Via Achille Campanile, 85 / Rome, Italy  00143




-----Original Message-----
From: Timo Sirainen [mailto:tss at iki.fi] 
Sent: giovedì 30 giugno 2011 7.36
To: Innocenzi, Cinzia
Cc: Del Coiro, Maria Giacinta; dovecot at dovecot.org
Subject: Re: [Dovecot] Dovecot 2.0.13 problem with LMTP

Try to apply these patches to both proxy and backend and see what it
logs then?

http://hg.dovecot.org/dovecot-2.0/raw-rev/1b1fc681a277
http://hg.dovecot.org/dovecot-2.0/raw-rev/36e7ded2ef0b
http://hg.dovecot.org/dovecot-2.0/raw-rev/537d4b6d9a7a

On Tue, 2011-06-28 at 08:38 +0000, Innocenzi, Cinzia wrote:
> Hello Timo,
> 
> so far I've seen this happening when proxying a mail for one recipient; I've never seen this happening for multiple recipients.
> 
> The other thing I've noticed is that if I reload dovecot, the mail usually gets delivered. Once, it remained stuck in the queue, but after a few hours, when I checked postfix's queue again, it got delivered. 
> 
> Let me know if you need further information.
> 
> Regards,
> 
> CINZIA INNOCENZI
> Technical Consulting
> HP Enterprise Services
> Telephone +39 06.6542.5758
> Email cinzia.innocenzi at hp.com   
> Via Achille Campanile, 85 / Rome, Italy  00143
> 
> 
> 
> -----Original Message-----
> From: Timo Sirainen [mailto:tss at iki.fi] 
> Sent: martedì 28 giugno 2011 2.04
> To: Innocenzi, Cinzia
> Cc: dovecot at dovecot.org; Del Coiro, Maria Giacinta
> Subject: Re: [Dovecot] Dovecot 2.0.13 problem with LMTP
> 
> On Wed, 2011-06-22 at 10:31 +0000, Innocenzi, Cinzia wrote:
> > Hello,
> > 
> > we have dovecot 2.0.13 installed in our RHEL5 servers. We use dovecot
> > as a lmtp proxy on the front end mail relays and dovecot for back end
> > lmtp/pop/imap. All our servers have RHEL5.6 64-bit and dovecot 2.0.13
> > installed, and the back end has also an ext3 mbox file-system mounted.
> > 
> > Sometimes we have mails that get stuck on our postfix queue with the
> > following error: Remote server not answering (timeout in DATA input)
> > (in reply to end of DATA command)
> ..
> > It doesn't happen for every single mail, it's random.
> 
> My guess is there's a bug somewhere in the LMTP proxy code. It's a bit
> annoyingly complex code.. Do you see this happening when proxying only a
> single mail (one RCPT TO per DATA, not multiple)?
> 
> And I would guess that when attempting to deliver the same mail again it
> works fine (at least in a few tries)?
> 
> 


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