- Anti-Spam SMTP Proxy (ASSP)
- Open source platform-independent SMTP Proxy server designed to eliminate spams by implementing whitelists and Bayesian filtering.
- Bopspam
- Online spam filtering that works with any ISP using a POP3 mailbox, works without software installation, and provides users the ability to add their own spam filter settings.
- CleanMyMailbox
- Automated, whitelist-based email filtering that requires no software to install nor configurations to make.
- Distributed Checksum Clearinghouses (DCC)
- Anti-spam content filter that works on multiple operating systems offered for free use to organizations that do not sell filtering services or devices.
- Fast PC Networks Spam Filter Service
- Offers high availability spam and virus filtering services for business email domains. System is redundant with filters colocated in data centers in different regions of North America.
- MailArmory
- Customizable turnkey service that filters spam and prevents malicious email, serving the needs of ISPs and hosting professionals.
- MailFilterPro
- Email spam and virus filtering service available in basic, enhanced, and enterprise packages.
- MailPolice
- Filters emails for viruses using real-time updates and proprietary algorithms. Provides personalized block/allow lists, email accounts consolidation, and child-safe options.
- Outlook Express Tutorial: Filters
- Step by step guide to activating MS Outlook's filter feature. Includes screenshots.
- SpamAid
- Features an easy-to-use MS Outlook add-on to protect user's inbox against spam. Features include Bayesian filtering technology, auto-learning abilities, quarantined e-mails, and more.
- SpamCop
- Spam reporting service with news groups and support forums.
- Webroot
- Managed email filtering service that includes archiving, image scanning, anti-virus, and encryption.
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