Intermittent mailbox not found

[Adam Tauno Williams]

> I have inherited a cyrus / postfix server, which is generally well-behaved.
> However, there is an intermittent error when delivering messages to a certain
> mailbox.  It is infrequent, and generally the message is delievered on the
> user's next attempt in his MUA.  The log is something like:

What format is your mailbox database in?  Do you see any concomitant
messages in the log?

> Mar  9 14:29:07 captain postfix/lmtp[20644]: D557618536:
> to=<sirius-john at munged-domain.com>,
> relay=captain.munged-domain.com[/var/run/cyrus/socket/lmtp], delay=0.1,
> delays=0.02/0.01/0/0.08, dsn=5.1.1, status=bounced (host
> captain.munged-domain.com[/var/run/cyrus/socket/lmtp] said: 550-Mailbox
> unknown.
> Either there is no mailbox associated with this 550-name or you do not have
> authorization to see it. 550 5.1.1 User unknown (in reply to RCPT TO command))
> Mar  9 14:29:07 captain postfix/cleanup[20642]: ED3B418538:
> message-id=<20090309142907.ED3B418538 at captain.munged-domain.com>
> Does anyone have any idea how I can go about debugging this?

Any chance you can increase the debug level of your MTA (postfix?) to
see the entire conversation?

-- 
OpenGroupware developer: awilliam at whitemice.org
<http://whitemiceconsulting.blogspot.com/>