Currently I observe a very strange behaviour with Bayesian filtering. For the last three weeks or so I recognized an increasing number of spams ending in the users mailbox. Currently kSPAM detects far less than 50% of the spam.
Example: This morning I cleaned up my new mail folder and confirmed any new spam found in MailSpam as spam. Since than I've got 13 new spam mail in my mailbox, but only one single mail in MailSpam, which has been put there due to a deny rule.
I've been using kSPAM for about 18 months and have never seen such a worse situation over such a long time (usually more than 95% spam goes to mailspam).
Today I looked closer at some of the SPAM mails received in my mailbox and detected (to my big surprise) words in KS_BL_TOKENS that don't appear anywhere in the corresponding mails body or subject. In addition KS_BL_TOKENS included words listed in KS_BL_IGNORE (in Notes.INI).
Does anybody have an explanation for this strange behaviour? Has anybody else seen this?
For the moment the only thing I can do is to restart the Domino server and hope that helps.
Depending on the number of documents I regularely cleanup the databases (mailspam/mailgood) by deleting some of the oldest documents. I'm not sure, but I have the feeling that the problem started after the last cleanup.
Domino is still 5.0.11. kSPam is 1.39b2. I'm not aware of any big changes to the Notes installation/configuration or the kSPAM configuration (except adding a few subject deny and address allow rules).