Messages Not detected as Spam

[Paul Wetter]

For the last week now I have been receiving several very similar messages that are spam and not being detected as spam.  I have done an sa-learn on every one of them but they still come in not even being tagged.  Is there something wrong with my bayes detection?  Is there any way to log what spamassassin is doing to see if it finds anything?   I call spamassassin's spam checks through amavisd-new which controls a couple virtual domains.   Thanks in advance, Paul