5.1.1 User unknown bounces

Kjetil Torgrim Homme kjetilho at ifi.uio.no
Sat Sep 9 10:19:59 EDT 2006

On Fri, 2006-09-08 at 10:45 -0700, Andrew Morgan wrote:
> 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.

DO NOT DO THIS!  if your Sendmail accepts _all_ possible local parts
during the SMTP transaction, you will be sending out lots of bogus
bounces to addresses abused (joe-jobbed) as senders of spam.

Kjetil T.

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