SpamSieve is a robust spam filter for major email clients that uses powerful Bayesian spam filtering. SpamSieve understands what your spam looks like in order to block it all, but also learns what your legitimate messages look like to avoid confusion. SpamSieve only marks spam in your email client so you never lose any mail. Works with: Apple Mail Airmail Emailer Entourage Outlook 2011 Outlook Express Eudora 5.2 or 6.x (Sponsored or Paid) MailForge MailMate Mailsmith GyazMail Postbox PowerMail