I wonder if anyone has any stats or anecdotal evidence on the relative effectiveness of Razor2, DCC, and Pyzor ?
I don't have any stats, just anecdotal evidence. I've found Pyzor to be effective, sometimes more so than Razor, sometimes less. Certainly when spam appears in both databases, it's almost guaranteed to be caught.
I haven't used DCC, mainly because its purpose is different. It deliberately includes legitimate newsletters because it doesn't measure how spam-like a message is, but how many people have received it. Since I manage a sitewide setup, it just seems like it would be too much effort to go through and whitelist every newsletter received by every user.
One thing I've found helpful with both Razor2 and Pyzor is to keep the timeouts short in local.cf. That way if some error comes up, it doesn't delay the mail too much.
Kelson Vibber
SpeedGate Communications <www.speed.net>
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