Megaphat Philter Gateway is a unique and amazing service to prevent spam and UCE reception. Using DNSBL, Philter utilizes an unlimited number of DNSBL Databases, Manual Blocking, Manual Exceptions by IP, Reverse DNS and A RR Alternative IP lookups.

Philter runs as a system service and offers real-time monitoring. For a corporate anti-spam solution, Philter is exactly what is needed. Non-protocol specific, useful for more than just SMTP and takes less than 3MB of your system resources.