I run Debian stable on my server, no need for the latest and greatest packages, just need it to be stable. Works very well. I run spamassassin and clamav and found in my logs that clamav is out of date. In trying to update it, I stumbled upon this project
So added to my sources list and updated clamav and spamassassin. Now its only been under 24 hours, but I have not gone a single spam email yet, and I normally get 80-100 dumped into my spam folder per day and about 5-10 slipping through. Check it out if you run Debian on the server.