Low resource rules

We use a Mailfoundry box to filter messages for our domains, we're paying for the mailfoundry per block of messages.

82% of the emails are filtered out via RBL. Rest gets blocked due to viruses and SA type issues, leaving us with 4.7% HAM - unbelievable but true.

So, I got the bright idea: let's get a $10 VPS account somewhere, run EXIM with its built in content scanning. I have plenty of firepower for RBL (I'm using sbl-xbl.spamhaus.org : dnsbl.sorbs.net : bl.spamcop.net : multi.surbl.org : spam.dnsbl.sorbs.net : bl.spamcannibal.org : dnsbl-2.uceprotect.net)

Problem is SA, I don't have enough computer to do serious content checking. Anyone care to recommend a few rules that will tend to catch a big chunk of the spam without sucking too much brainpower from this VPS box?

TIA Received on Sat Sep 29 14:44:42 2007