5.1.1 User unknown bounces

Andrew Morgan morgan at orst.edu
Fri Sep 8 13:45:54 EDT 2006

> jschueler at motorcityinteractive.com wrote:
>> My effort to install Cyrus has been largely successful.
>> I would expect to see a function to bounce email with a "5.1.1 User unknown"
>> error.  But I haven't seen this function described or even acknowledged
>> within Cyrus.
>> As far as I understand, I need a hook for my MTA (Sendmail) to query.  Does
>> one of the /usr/cyrus/bin utilities provide this function?  It seems easy
>> enough to roll my own.  How do other Cyrus administrators handle this
>> requirement?

If you are running Sendmail, look into Sendmail's socket map support 
(smmapd).  The Cyrus 2.2.3 changes list:

   Sendmail socket map support (smmapd) for verifying that mailboxes exist
   and are deliverable before accepting the message and sending it to

Otherwise, just let Sendmail queue the message and attempt to deliver the 
message to Cyrus.  If the user does not exist, Cyrus will let Sendmail 
know during the LMTP handshake.


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