Spamfilterisp.com: Spam Filter ISP - spam filter server for Windows | Spam Filter ISP
Spam Filter ISP is an Anti-spam server software for Windows that acts as a gateway/proxy to your existing SMTP server (MTA). Spam Filter filters email based on MAPS RBL and DNS based ORBS and SURBL blacklists, Greylisting, Bayesian statistical filtering and SPF filters. An antivirus plugin is available for anti virus support. A web interface for end-user access to the spam quarantine is available.
Gfi.com: GFI - Web, Email and Network Security solutions for SMBs on premise and hosted
GFI offer fax server solution, email anti-virus and anti-spam software for Microsoft Exchange and email servers; Network security and monitoring tools; event log monitoring solutions for Windows NT/2000/2003.