Two days ago our spam filtering went from about 75% effective to about 5% effective. We haven't made any change to the server. The statistical filtering is running but it is showing that most emails have a probability of .000000 of being spam when we look at the logs. We are running 8.12. Has anyone else experienced anything similar?
It sounds like the naive Bayesian filtering died. That's one reason why it is important to have many different tools in your anti-spam arsenal (Declude JunkMail was one of the first anti-spam programs to rely on multiple methods of detection). I'm guessing you have a gateway in front of your IMail server, preventing the IMail v8 IP-based anti-spam tests from working (you need a fully featured anti-spam program to properly handle gateways and backup mailservers).
To help with your specific problem, though, most likely the file with the list of words and their probabilities got deleted or corrupted. If you create a new one by having your users feed the engine with your spam and legitimate E-mail, it should fix the problem (to get a quick start, you can download the default one from Ipswitch, although it won't be as accurate as one created with your own information).
-Scott
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