I have to admit, I've been a little lazy in the blog posting, after spending all day writing specifications for the next version of SBS, I haven't got the fingers left to dance over the keyboard to share my knowledge with you. Plus of course, my knowledge is confidential (for the most part) at this time.
No, I don't wear an ear-plug and answer to the name of "Agent 3".
Anyways, looking at our specs for Exchange 12 anti-spam configuration, I came across something that's public, and will probably help you understand how the Anti-spam engine works on Exchange. This is of course for Exchange 2007, but most of it applies to Exchange 2003. The full article is available over on TechNet. But for the purposes of this blog, here's the meaty detail: