Anyone any experience of 'Untangle' Spam Blocker Lite?
Just had a look at it. You don't need half the rubbish its got.
If you've already got a nix*/nux* gateway box, then just run your favourite MTA (postfix/sendmail/qmail etc.) .... configure it for DNSBL and RBL lookups against decent blacklists and that's all you need .... it will catch 99% of spam.
All stuff like Bayesian Filters, Razor and OCR does is increase the chances of false positives.