Starting sometime this morning, all messages have been tagged as spam because of BAYES_99. Any ideas about what would cause this?
Lousy bayes training usualy. Using bayes with auto-learning only is a common cause. Another cause is using forwarded messages to train without doing something to recover the original message headers.
First, I'd do a quick sanity check run spamassassin --lint and make sure it's not complaining about the bayes database.
Then running some messages through spamamassassin -D and see what tokens the message hits. Each token will be reported with a number between 0 and 0.999999999. The higher the number, the more spammy the word is considered to be.
If your bayes database is heavily poisoned you can correct it by manual training, or by deleting the database and starting over. (find the bayes_* files used when your mail comes in and delete them. Typically it's /root/.spamassassin/bayes_*)
