SPAMReporter   
http://spamreporter.errorcodes.net

SPAMReporter is a powerful award winning spam reporting tool that works by analyzing the email header information and determining where the email originated on the Internet. Many spam messages attempt to hide their tracks by forging entries into the header. SPAMReporter checks each line to determine its authenticity and signaling out the actual entry point onto the Internet. Once the entry point is found, SPAMReporter then finds an Abuse contact for the IP owner, and sends an email containing all the evidence and information, in the format they require to suspend or terminate the offending account. SPAMReporter differs from on-line header analyzers and spam filtering programs that report by using a special system folder on your desktop called SPAMDrop. Completely unattended, SPAMReporter will check this folder and processes all messages it contains. This allows you move all your spam from your Inbox to the SPAMDrop folder and let SPAMReporter take care of the rest. Reporting spam to the owner of the IP where the message originated is by far the best way to stop spam on the internet, as most of these IPs are systems with security problems that the Spammer has compromised. SPAMReporter works with any email application that allows the drag and drop messages from the inbox. If your application does not allow this or you are using a webmail application such as Hotmail, SPAMReporter can convert these messages and add them to the SPAMDrop with the Webmail conversion feature. Stopping spam at the source, where it originates, is the only way to eliminate Spam. Filtering is a good idea, but not the answer to spam.

Junk-Out for Outlook 2003/2002/2000   
http://www.TheOfficeMaven.com

Junk-Out keeps junk mail out of your Microsoft Outlook Inbox, using a combination of statistical methods (Bayesian filtering) and information you provide, to show only e-mail messages you want to see. The more you use Junk-Out, the better it gets at distinguishing useful e-mail, and getting junk out of your way. The heart of Junk-Out is its continually learning content-based / Bayesian filter mechanism. This feature can use a Fast Track word list, a 'seed' vocabulary of over 30,000 words, to start filtering junk out of your incoming e-mail as soon as you install it. Then it gets better with every e-mail you receive, adding to its knowledge from experience and the training you give it with just a click of the mouse. The Basic Version (Basic) keeps it simple: just use it as you find it at installation, and train it by marking any messages that are misclassified upon arrival. If a new message arrives and is not marked as junk by the program when it should have been, click the Mark Message as Junk Mail button on the Junk Mail Tools toolbar/menu to reclassify the message and 'teach' the Bayesian filter to recognize similar messages as junk from then on. Similarly, if a new message is marked as junk but should not have been, click the Mark Message as Non-Junk Mail button on the Junk Mail Tools toolbar/menu to reclassify the message and 'teach' the Bayesian filter to recognize similar messages as 'good' from now on. You can also use the Add to Friends List button on the Junk Mail Tools toolbar/menu to add the sender of good messages to your Friends list, which ensures that Junk-Out leaves all their messages in your Inbox without further filtering. With the Professional Version (Pro), you can make Junk-Out as straightforward or as sophisticated as you like. You can use all the Basic features. To 'fine tune', you can choose whether and how the features work, tailoring Junk-Out to your individual preferences.

Alchemy Spam Filter for Outlook Express   
http://www.alchemy-lab.com

Get rid of spam with Alchemy Spam Filter for Outlook Express! Alchemy Spam Filter is a plug-in module for the Outlook Express e-mail program and represents a self-adaptive unsolicited mail protecting tool. The main method used to combat spam is the statistical algorithm of Bayes. The Bayesian filter is the most efficient anti-spam solution nowadays. Based on self-learning technology, it is more effective than other traditional anti-spam techniques, based on static blacklists checking and keywords databases. Properly learned, this filter can reach spam detection rate up to 98% with minimum false positives. Alchemy Spam Filter also supports the user defined white, black and ignore lists that can be a useful addition to the Bayesian engine correcting its behavior.

SpamSquash   
http://www.alwayslearn.com

SpamSquash is a spam filter for email clients that connect to pop3 email servers. It uses two filtering methods: a Bayesian filter and a DNS block list. The Bayesian is trained by you to get emails you consider to be spam. The DNSBL uses spam repositories to determine what is spam. The filter is over 99% accurate. It also includes a white list and a black list. You can use one filter or both filters together. You can use it with Outlook, Outlook Express, Pegasus Mail, etc. You can download a free trial version at www.alwayslearn.com.

CAMELOT Security   
http://www.atrium-software.com

CAMELOT Security 2005 is a server side based spam filtering solution for MS Windows platforms. Incoming messages run through a chain of different application layers inside a multi-tier protection system. Several methods of analysis are executed by active content processors, using artificial intelligence with self-learning filter processes. A special SMTP gateway verifies the identity of the sending instance and denies all further processing as soon as an invalid incident occurs. This prevents unauthorized access before the message is delivered to the regular mail system. A structured profile set, based on network and account attributes, is used to address message contents in consideration of different requirements. Individual anti spam rules are executed, depending on the related user or network location. The evaluation of unknown content schemes takes effect by Bayesian classification methods. Intelligent content processors identify the appropriate category by calculating the conditional probability of the affected content. Also pornographic contents in images can be detected in this way. Well known anti virus products can be integrated to prevent virus infection. A special interface to Norman Virus Control offers a proactive solution to protect the system against new and unknown viruses. Multiple messages are processed simultaneous in a multi threaded environment. This guarantees unrestricted email transfer, even if the system is busy with single large messages. The usage of SQL databases for the storage of generated pool data provides high performance also in large messaging environments. The message processing is server side based and thus controlled at a centralized level. This protects the rest of the network from dangerous contents. Explicit boundaries between secure and insecure areas are set in this way. This minimizes the remaining risk, caused by weak points somewhere in the network.