Spamihilator - The free Anti-Spam-Filter Spamihilator removes more than 98% of spam mails before they even get into your inbox.
Proofpoint - Proofpoint provides cloud-based email security, e-discovery and compliance solutions for companies to protect sensitive business data.
Mailwasher - Over 8 million people use MailWasher as their spam filter
Hornetsecurity - Hornetsecurity offers you comprehensive, integrated managed e-mail security services.
SPAMfighter - SPAMfighter and Microsoft have built the strongest and most effective anti spam filter for Outlook, Windows Live Mail, Outlook Express & Thunderbird
Happy Moose - Happy Moose is a super-efficient cloud anti-SPAM solution for organizations. It stops up to 99.