Intermittent mailbox not found

Adam Tauno Williams awilliam at
Mon Mar 9 16:21:22 EDT 2009

> 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>,
>[/var/run/cyrus/socket/lmtp], delay=0.1,
> delays=0.02/0.01/0/0.08, dsn=5.1.1, status=bounced (host
>[/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>
> 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

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