SpamAssassin!

BitNinja is an easy-to-use server security tool, which can be installed on your server within a couple of minutes and requires virtually no maintenance. It is a mixture of an on-premise and cloudbased solution. It is an agent which sits on your infrastructure and sends the attack information to the central server which is in the cloud. We have a new technology called defence network, which means that every BitNinja protected server learns from each attack and shares the learned information with the central server and with all the other BitNinja enabled servers, so the shield just gets stronger and stronger with every single attack. »

MailScanner scans email for viruses, spam, phishing, malware, and other attacks against security vulnerabilities and plays a major part in the security of a network. By virtue of being open source, the technology in MailScanner has been reviewed many times over by some of the best and brightest in the field of computer security from around the world. MailScanner supports a wide range of MTAs and virus scanners to include the popular open source Clam AV. Spam detection is accomplished via SpamAssassin, which is by far the most popular and standardized spam detection engine. »

Over 8 million people use MailWasher as their spam filter

Scrollout F1 is a free self-hosted email gateway designed for Linux & Windows administrators without advanced email security experience.

Bogofilter is a mail filter that classifies mail as spam or ham (non-spam) by a statistical analysis of the message's header and content (body). The program is able to learn from the user's classifications and corrections.

Spam Reader is a free anti-spam add-on for Microsoft Outlook. The software uses the most reliable approach to block junk emails - Bayesian algorithm based on statistical analysis, capable to be adjusted to user's needs and detect up to 98% of spam messages. Spam Reader automatically scans all incoming mails and sends detected spam messages to the special folder for further review.

Anti-spam gateway blocks more than 99% of spam with less than one in 1 million false positives and real-time automatic updates.Antispam filtering engine powered by Brightmail - a set of technologies that identify email borne threats based on reputation on both the global and local level.Strong data loss prevention capabilities ensure customers stay in regulatory compliance.Customer- Specific Rules allow customers to easily create rules based on email they consider to be spam or on potentially targeted attacks.Optional encryption integration with Symantec Content Encryption or Symantec Gateway Email Encryption.Key BenefitsProtects sensitive client data and valuable confidential information, with the ability to fingerprint and identify actual company data within messages or attachments.Protects company reputation and manages risks associated with data loss, internal governance, and regulatory compliance.Optional Symantec Content Encryption subscription integrates email encryption into Messaging Gateway console, leveraging powerful built-in spam filtering and data loss prevention policies.Includes a dashboard, summary reports, and detailed reports demonstrating the efficacy and impact of anti-spam gateway while proactively highlighting threat trends and potential compliance issues.Reduces administrative costs by removing the complexity of multiple consoles, disparate policies, and incompatible logging and reporting, while demonstrating efficacy and impact of messaging security.Flexible, configurable, easy-to-use Messaging Gateway Virtual Edition runs on VMware or Microsoft Hyper-V hypervisors in the hardware environment of the customer’s choosing.Targeted Attack Protection: Disarm, a proprietary Symantec technology, helps protect against targeted attacks and zero day malware by removing exploitable content from Microsoft Office and PDF attachments. »

Professional e-mail security free for private use: With Spamfence.net eleven offers the professional e-mail security of the spam filter and e-mail categorisation service eXpurgate absolutely free for private use!This free spamfence service nevertheless is identical with the commercial eXpurgate.ASP version and reqires only a minimum of time and effort by the user to be activated. eXpurgate - the professional filter from eleven against undesirable e-mail advertisement, free of charge for private users under http://www.spamfence.net/how-does-it-work.html ! »

SpamSieve is an extremely accurate and easy to use Bayesian spam filter for Mac e-mail programs. Macworld's "Software of the Year".

Most people find spam e-mails the biggest nuisance on the Internet. Today, spam e-mails account for over 80% of all e-mail traffic and their volumes increase daily. Strike back with BullGuard Spamfilter.

MailRoute provides a hosted service for mail protection from virus and spam.

Happy Moose is a super-efficient cloud anti-SPAM solution for organizations. It stops up to 99.7% of SPAM, and no false positives. It means that you don't need to sift through your huge "Junk" folder.

Postgrey is a Postfix policy server implementing greylisting developed by David Schweikert.

This program helps you block spam and worms before they reach your mailbox.