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Outbound Spam Proxy
Most spam filtering is done on inbound email. I myself am extremely happy with SpamAssassin and a few other antispam hacks.
However, since I am a sysadmin, I get to play with stuff that most folks never even think about. One of my projects involves networking services for large groups of users (think ISP, office buildings, hotels, etc.... see this article ). To wake up and find that spam is originating from one of my networks would be a Bad Thing — hence this page.
I haven't looked closely enough at vthrottle yet, but something like this might be part of the answer.