milter manager is a free software to protect you from spam mails and virus mails effectively with milter.

signing-milter enables you to s/mime sign an ordinary mail while passing a MTA. Base on https://signing-milter.org/ by Andreas Schulze

Milter interface for the amavis spam filter engine.

Library of supporting functions, APIs, and tools for SnertSoft BarricadeMX and milters.

Extracts URLs from a mail message and checks it against one or more URI blacklists.

signing-milter enables you to s/mime sign an ordinary mail while passing a MTA

An interface to the popular open source SpamAssasssin mail analysis tool, which returns a score based on a comprehensive set of patterns and Bayesian checks.

Block connections from remote sites that are sending spam, thus reducing load on your mail server.

Limit the number of messages by connecting client IP, sender, or recipient.

An independent implementation of the RFC 4408 Sender Policy Framework (SPF-Classic).

Grey listing is an anti-spam technique that keeps track of tuples consisting of the connecting IP, sender's envelope, and recipient's envelope. If a tuple, does not exist in the cache, then a new entry is added and kept until it expires and the message is temporarily rejected.

A “call-forward” milter for mail gateways to verify that mail recipients exist on an authoritative mail store before the gateway accepts the message.

Provides a means by which client connection and envelope details and/or message headers and content can be filtered using shell commands or scripts. Intended as a way to implement quick & dirty content filtering solutions when there is no other suitable milter available.

Provide an interface to the popular open source Clam Anti-Virus scanner.

An independent implementation of the RFC 4408 Sender Policy Framework (SPF-Classic).

Provides a means by which client connection and envelope details and/or message headers and content can be filtered using shell commands or scripts. Intended as a way to implement quick & dirty content filtering solutions when there is no other suitable milter available.

smf-spamd: Smart Sendmail Filters

Fast lightweight SPF mail filter for sendmail

Provide an interface to the popular open source Clam Anti-Virus scanner.

A “call-forward” milter for mail gateways to verify that mail recipients exist on an authoritative mail store before the gateway accepts the message.