For some reason, got blitzed with spam today. So, I finally got around to installing spamassassin - doing it via CPAN died, though, as it was dying in the make test. So I made it by hand and now it's humming along, working quite nicely.
It's slow as ass on my P100 mail server, but better a little slow than let myself get blasted with spam all the time.
Tomorrow night's project: install it on the other mail server and set it up for my dad so he can have some automated spam protection.