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Egress spam filtering



Hello all!
 
I have seen quite a bit of topics regarding filtering incoming mail, not so many about outgoing filtering.

Does anyone have any suggestions for controlling authenticated users from spaming or detecting this type of activity with qmail?  I've thought about limiting the number of recipients a message could have and limiting the amount of messages a system can forward to the qmail server for a given time frame.  Are these options available in qmail?  Any other suggestions?
 
TIA!
Christopher Davis