Hi, I finally found why mail were bypassed by spamassassin. It was a misconfiguration in my MySQL database. I use this db to store different spam policy and one of the policy had an empty column 'bypass_spam_checks'. Maybe the PHP frontend I used to modify policy is buggy (but that's another story). Anyway, I forced 'bypass_spam_checks'=N in my database and everything now works as before :)
Thanks.
