One of the tricks spammers do is send to the backup servers first because they often have less filtering. If you want I have a free MX backup service that helps me harvest those bots. Here's a couple of solutions:

http://wiki.junkemailfilter.com/index.php/Project_tarbaby
http://www.free-mx-backup.com

Dave wrote:
Hello,
	Mail from my backup mx is not being scanned for spam as it's coming
in. Is this something i'd have to turn on at the MTA level, content filter,
or SA? A majority of stuff my backup mx sends me is spam and i'd like to get
it tagged as such.
	Thanks.
Dave.


  

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