You could write a filter that searches the headers for your backup server's IP address.

HEADERS   3   CONTAINS   x.x.x.x

Matt



Robert Grosshandler wrote:
We do that already and it works fine.  However, I know that there is a much
higher probability that any mail that passes through the backup MX is spam,
so I want to add additional weight just because it comes through the backup
MX.

Rob

Jeff wrote:

  
Use the IPBYPASS %sec mx ip% feature within the GLOBAL.CFG file.  It will
    
skip the ip address of your secondary mx record >and run the check on the ip
address of the originating server.

  
IPBYPASS	xxx.xxx.xxx.xxx
    

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