"Standing on the shoulders of giants...."
This is an SMTP sink for Microsoft Exchange 2000/2003 that utilizes SpamC (integrated into the sink) to provide spam filtering on inbound mail with Spamassassin. The integrated SpamC client is based on WinSpamC (spamC built for Windows).
It does not put much (if any) additional load on the Exchange server, nor does it delete any mail - it modifies headers and subject lines, and even creates the nifty spam reports in the messages.
It requires a Linux box with Spamassassin running on it to process the mail (any old system will do- a Pentium II will get you started nicely and basic instructions are included.)
Does the same thing that products that cost money do. If you like it, let me know.
Questions? Contact Tom.