OT? /dev/null 5.1.1 email

Tue Jul 5 21:18:15 UTC 2005

At 4:00 PM -0400 2005-07-05, Jim Popovitch wrote:

>  However, is seems the problem is over on the secondary MX (Postfix)
>  which only has a list of legit relay domains for pMX.  When pMX is back
>  online sMX fwds it's queue, but at that point pMX rejects to sMX...who
>  then rejects to Sender.

	Yup, and a lot of spammers take advantage of this fact by 
directly connecting to the secondary MXes of their targets, and never 
connecting to the primary MXes.

>                            I'm not sure how I can get away from that
>  happening.

	Short of having a complete list of all your valid recipients on 
the secondary MX, or having some way for them to obtain this 
information, I don't think you can.  Also note that you have to 
completely replicate the full anti-spam/anti-virus configuration from 
the primary MXes to the secondary MXes, for the same reasons.

-- 
Brad Knowles, <brad at stop.mail-abuse.org>

"Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety."

     -- Benjamin Franklin (1706-1790), reply of the Pennsylvania
     Assembly to the Governor, November 11, 1755

   SAGE member since 1995.  See <http://www.sage.org/> for more info.