A milter that performs DKIM and ARC signatures.

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

smf-spamd: Smart Sendmail Filters

DKIM signing for the mailserver project

Docker image for Amavis in mailserver

It's a lightweight, fast and reliable Sendmail milter that implements the Sender Policy Framework

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

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

Reject mail according to different message size limits per IP, domain name, or sender address.

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

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.

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.

Pure Python-asyncio Milter framework

Python bindings for libmilter api

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

Implement milter protocol in Go

A LDAP based authorization milter to control inbound/outbound email traffic

DeepSpam milter v1

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.

Add to the recipient list of any inbound and/or outbound message one or more blind-carbon-copy (Bcc) recipients depending on the MAIL FROM: and/or RCPT TO: addresses for any given message.