Mailwasher
To successfully combat email spam, use this sophisticated spam blocker program. Learn how to safely stop unsolicited e-mails from reaching your PC. There are no tricks here; it's so simple to set up and use that you'll be handling your email like a pro in no time. Because spammers can't detect if you've read your email in MailWasher, it can even be used as a privacy tool.
MailWasher is completely free and will never expire. Outlook, Outlook Express, Incredimail, Thunderbird, Windows Live Mail, Gmail, Hotmail, Yahoo, EM Client, and all other email programs are supported.