lmtp should give temporary failure for mailbox unknown

[Jo Rhett]

I have seen this behavior.  It happens when a mail account exists in 
authentication (ie mysql) but when the mailbox doesn't exist yet.

Are you using autocreate inbox?  If so, are you sure that the inbox 
exists for these mailboxes prior to the message delivery?  Or you could 
enable "createonpost"  (I recommend against this for oh-so-many reasons, 
but YMMV)

Simon Matter wrote:
> It would also be interesting to find out why you get the 550 error. I'm
> not using lmtp over tcp but only local via socket and I have never seen a
> 550 error.

>> On 11.10.2006 17:31, Ramprasad wrote:
>>> Everything seems to work fine but sometimes lmtp gives strange errors
>>> like
>>>
>>>  to=<X>, orig_to=<X>, relay=202.162.229.40[202.162.229.40]:24,
>>> delay=0.26, delays=0.25/0/0/0.01, dsn=5.1.1, status=bounced (host
>>> 202.162.229.40[202.162.229.40] 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))
>>>
>>>   When actually the mailbox is valid. The same mail sent again reaches
>>> the mailbox without problems. The cyrus server is highly loaded most of
>>> the time.

-- 
Jo Rhett
Senior Network Engineer
Network Consonance