SpamHero - SpamHero is a professional spam filtering accuracy while lowering the cost to domain and business owners.
Spamihilator - The free Anti-Spam-Filter Spamihilator removes more than 98% of spam mails before they even get into your inbox.
SpamAssassin - Use this program to "Unspam" your mailbox(es).
Mailwasher - Over 8 million people use MailWasher as their spam filter
SpamTitan - Comprehensive Email Protection. 99.99% Spam Detection. Blocks phishing, viruses, malware and other email threats.
SpamExperts Outgoing Filter - The outbound email filtering prevents spam from being unknowingly sent out of your network through a compromised account or script.