Matador Spam Fighter   
http://blogs.clearscreen.com

Matador Spam Fighter avoids all unsolicited emails from collapsing your inbox. A great improved bayesian filter analyzes each email content and determines it spam probability against the knowledge base acquired by automatically learning from your existing emails. Matador Spam Fighter is completely adaptative to you incoming mail and will automatically learn from it to become the most accurate spam filter for your inbox. No special actions are required during installation, just double-click and go!! Its sophisticated engine will check every incoming email through different filters and technologies that include Bayesian Filtering, Realtime DNS Black List, Content Checks, Realtime DNS White List, Bonded Sender Programs and Contacts Whitelists. Give it a check. It's totally free of charge.