MailGuardian (OS X)

SubRosaSoft Mailguardian is a collection of tools that help guard your e-mail. Integrating automated redirecting and very flexible blocking, it not only helps manage your important or urgent e-mails but can remove most unwanted e-mails before you have to bother with a long list of spam. Keeping the focus on guarding data, MailGuardian can watch for important e-mails - by looking for specific phrases then redirecting those e-mails to another address of your choice. Assisting with the global fight on unsolicited e-mails MailGuardian automatically downloads a new list of known spammers, and key phrases found in spam, then deletes matching e-mails before you have to see them.

Requirements:

Mac OS X 10.2