Mail Filter is a very versital add-on to Mail Server. I have an example on my web site, that shows some stats and how I use Mail Filter to record it. I also use the Mail Filter add-on, Paranoid, available from the same company. It should handle any quantity of messages that ArGo Mail Server can handle.
Here is the Link for my article:
http://www.topcatcomputing.com/articles/displayarticle.asp?DocId=21
Instead of tracking incoming messages, you can track outgoing, by user and see how much of it paranoid rates as spam.
Your best bet is to try the trial version of MF & Paranoid and see if it meets your needs.
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