SpamWeed Anti-Spam Filter   
http://www.spamweed.com

SpamWeed is an innovative spam filter for all POP3 email clients (Outlook, Outlook Express, Eudora, Incredimail, Pegasus Mail and others). It uses a combination of statistical classification, ID-tracking and other state-of-the-art technologies. SpamWeed can block over 95% spam instantly with almost no false positives. Emails classified as spam are placed in a quarantine area and can be safely retrieved or deleted. Auto-learning feature further increases detection accuracy by analysis of users' correspondence. The program can even neutralize all current and future email viruses. While it's powerful and intelligent, it's also very easy to install and requires almost no maintenance. Your time is precious, let SpamWeed handle all those annoying junks.

SPAMfighter SMTP Anti Spam Server   
http://www.spamfighter.com

SPAMfighter SMTP Anti Spam Server, is the easy-to-use anti-spam solution for Microsoft Windows Servers. SPAMfighter SMTP Anti Spam Server is powered by the SPAMfighter Server, which is updated by the SPAMfighter community of more than 1.2 million users across the globe. SPAMfighter SMTP Anti Spam Server delivers instant spam protection with no configuration or maintenance what so ever. As email arrives and the SMTP Server routes it to its addressees, SPAMfighter constructs a unique signature for each message and sends it to the SPAMfighter Server for evaluation. If the SPAMfighter Server determines that a message is spam, it filters the mail before it is moved to the user's spam folder.

Matador Spam Fighter   
http://blogs.clearscreen.com

Matador Spam Fighter avoids all unsolicited emails from collapsing your inbox. A great improved bayesian filter analyzes each email content and determines it spam probability against the knowledge base acquired by automatically learning from your existing emails. Matador Spam Fighter is completely adaptative to you incoming mail and will automatically learn from it to become the most accurate spam filter for your inbox. No special actions are required during installation, just double-click and go!! Its sophisticated engine will check every incoming email through different filters and technologies that include Bayesian Filtering, Realtime DNS Black List, Content Checks, Realtime DNS White List, Bonded Sender Programs and Contacts Whitelists. Give it a check. It's totally free of charge.

Ella for Spam FREE   
http://www.openfieldsoftware.com

Ella for Spam FREE is the first Smart Inbox Assistant which learns by example how to personally organize and automate the processing of email messages from within the Outlook Inbox. By using a Wizard and integrated training toolbar, users simply provide Ella for Spam FREE a few examples of messages to keep in their Inbox, and messages to move to "Later Reading" and "Spam" review folders. Ella quickly learns the user-defined profiles and automatically places all new messages in the appropriate folders. The user can easily define new personal classifications for processing actions, converting these two classes into, for example, "Engineering Matters" and "Personal Correspondence". Ella's adaptive learning engine is built on a high-performance associative memory technology that observes user examples, then creates, updates, and maintains a message classification model unique to each individual. Over 100 attributes of the user's example messages are analyzed and learned by Ella in order to create the profile for the user-defined message categories. As the user's class definitions or preferences change, Ella adapts in response to user actions as new messages are moved, continuously refining the model of user's email sorting behaviors. FREE version adds 2 line promotional signature to outbound email - purchase version does not.

Ella for Spam Control   
http://www.openfieldsoftware.com

Ella for Spam Control is the first Smart Inbox Assistant which learns by example how to personally organize and automate the processing of email messages from within the Outlook or Outlook Express Inbox. By using a Wizard and integrated training toolbar, users simply provide Ella for Spam Control a few examples of messages to keep in their Inbox, and messages to move to "Later Reading" and "Spam" review folders. Ella quickly learns the user-defined profiles and automatically places all new messages in the appropriate folders. The user can easily define new personal classifications for processing actions, converting these two classes into, for example, "Engineering Matters" and "Personal Correspondence". Ella's adaptive learning engine is built on a high-performance associative memory technology that observes user examples, then creates, updates, and maintains a message classification model unique to each individual. Over 100 attributes of the user's example messages are analyzed and learned by Ella in order to create the profile for the user-defined message categories. As the user's class definitions or preferences change, Ella adapts in response to user actions as new messages are moved, continuously refining the model of user's email sorting behaviors.