I recently heard about Spamassassin, and was thinking about setting it up. I mentioned it to the guy who runs my website’s hosting service and within a couple hours, he just had it running. I’ve taken the somewhat Procrustean measure of deleting all spam before it even gets to my computer, so if you write to me and don’t hear back, it might be because spamassassin mistook your mail for spam. But it seems to be pretty smart.