[Dovecot] Mail lost - maybe a bug???

[Timo Sirainen]

On Tue, 2011-12-20 at 12:46 +0100, Marco Carcano wrote:
> Hello Timo and Urban
> 
> I took quite a long time to reply, but as I told you this issue does  
> not verify very often, so I had enabled verbose logging and just  
> waited ..

Enabling mail_log plugin and/or lazy_expunge plugin would have helped
more (both mentioned in my previous mail).

> I summarize the situation - user mmanzoni sometimes does not receive a  
> message - it does not matter if he is the only recipient or if there  
> are others
> 
> its outlook 2010 is configured for POP3 mail and to leave all messages  
> on the server, and setup to never delete them (neither after a few  
> days, neither when he deletes from his trash folder). There are not  
> any other client that log to that mail account: this is the only one  
> client that download messages
> 
> the following extract of the LDA log shows what happened: the message  
> was sent to 4 users (I report just 2 of them: criva, that received it,  
> and mmanzoni, who didn't)

There's really nothing in the LDA log that could explain why the message
gets lost. It most likely was successfully delivered by LDA, but got
deleted afterwards for some reason.

You mean that this user's mails are never supposed to be deleted via
POP3? Verify that with:

grep 'pop3.*mmanzoni.*del=[^0]' /var/log/dovecot.log

or wherever those POP3 disconnection messages are logged, i.e. you
should find lots of messages with:

grep 'pop3.*mmanzoni.*del=0' /var/log/dovecot.log