Email anti-spam filter

I need a anti-spam program using beyesian algo, here are some links: 1. <[login to view URL]>? ....? ? ? Fast Bayesian Spam Filter 2. <[login to view URL]> 3.? <[login to view URL]> 4. <[login to view URL]> If you have a product ready then that woul dbe preferred. Anti-spam should scan emails while downloading and not after thet are downloaded. We also need webfilter to scan the web pages for viruses etc.