On Wed, 4 Jun 2008, Alain Terriault wrote:
What is todays most effective combination to filter spam ?
We use a three-way combination (on a CentOS 5 base), in this order:
1. sbl-xbl.spamhaus.org 2. clamav-milter 3. spamass-milter (milter-ized spamassassin)
Our server only handles about 50 user accounts, so it's not an industrial-strength setup by any means -- though our uptime is well above our internal SLA, and most of our employees have a fairly active e-mail life. :-)
All bounces happen during the SMTP transaction, so there's no backscatter problem.
In a typical week, spamhaus will block ca. 60% of inbound traffic, spamassassin 10%, and ClamAV 2-3%. We end up delivering only about 25% of the messages we receive from the Internet.
We use rpmforge packages for everything.