Intermittent mailbox not found

Adam Tauno Williams awilliam at
Wed Mar 11 08:53:01 EDT 2009

On Tue, 2009-03-10 at 11:29 +0000, Antony Gelberg wrote:
> On 2009-03-09, Adam Tauno Williams <awilliam at> wrote:
> >> 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?
> Not sure what format it's in - I'm new to Cyrus but I thought it had its own
> format, similar to Maildir? 

Not the mail spool (/var/spool/imap?) but the metadata spool
(/var/lib/imap?).  There are multiple databases in the metadata spool,
one of which is the mailbox database that lists the mailboxes, their
ACLs, etc... These databases can be in a variety of formats: skiplist,
berkley db, flat, etc...   It is important to see if you have an DBERROR
(berkley) or skiplist error messages in your log as that might relate to
the problem.

[root at sardine imap]# pwd
[root at sardine imap]# file mailboxes.db
mailboxes.db: Cyrus skiplist DB

>  I had to look up concomitant in the
> dictionary, and I don't believe there are 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?
> Done that, but will have to wait for another failure.
OpenGroupware developer: awilliam at
OpenGroupare & Cyrus IMAPd documenation @

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