SpamAssassin 2.50 is out. This is the big release with the Bayesian filter and a bunch of other new spam trapping features. I’ve already installed it and tested it, and it appears to work. It seems to me that spammers are starting to try to evade SpamAssassin’s ruleset, or try to make their spam shorter and less spamlike in general, and more of it was getting through. Hopefully the new release will let less spam fall through the cracks. (I have to say, though, that even though things had gotten worse, SpamAssassin was still probably catching 90-95% of the spam that I get.)
Update: It looks like there’s some work to be done to get the Bayesian filter working. I have to dig a bit more into that.