I use sendmail and spamassassin-milter. I configured SA to tag messages as spam if they score 6.0 points. The milter rejects if the score gets above 15. I use every plugin available, dcc, fuzzy, razor, pyzor, DNSBL etc, so usually spam scores above 15, and I have never seen a false positive with a score higher than that. This counts for about 80-85% of all spam I receive, and spam being 90-95% of total mail volume.
Messages that score between 6.0 and 15.0 are delivered to the user (on exchange), with altered subject and original message as attachment (report_safe). I would say, that bayes is the most valuable tool when it comes to messages that have a lower spam score. Almost all messages that score 6-9 points are scored 3.5 by bayes (99-100% certainty) and hence would not be tagged as spam if I would not use bayes. This is about 10-15% of all spam I receive. The remaining 5-10% scores 10-15. I have seen only a few false positives in the 6-15 range, never scored by bayes. In my set up bayes has a near 100% accuracy. ISPs usually reject all mail above a certain score, regularly set to 4-5. This will result in more FPs, considering their usually high mail volume. In the end it's all a choice between relaying more spam to subscribers or putting more work into manually whitelisting etc. But in any case the configuration should include bayes, DNS blacklisting and the usual regexp rules. For higher accuracy, but also higher server loads, other plugins can be used too. -Sietse -----Original Message----- From: R Lists06 [mailto:[EMAIL PROTECTED] Sent: Wednesday, December 06, 2006 4:45 PM To: [email protected] Subject: required_score aggressive ?? When looking up required_score info, as most know, it say that the default is 5.0 and that it is considered aggressive in various circumstances Used to be called required_hits When I first started using SA I was told that as an ISP going in the 4.0 range give or take a little was an excellent choice. If you are able to chime in, please share your wisdom in any area about required_score and/or just how aggressive is everyone on the list as I am thinking of tweaking a little lower. Thanks in advance - rh -- Robert - Abba Communications Computer & Internet Services (509) 624-7159 - www.abbacomm.net
