Filtering Mail with Sendmail

Introduction

Sendmail's Content Management API (milter) provides third-party programs to access mail messages as they are being processed by the Mail Transfer Agent (MTA), allowing them to examine and modify message content and meta-information. Filtering policies implemented by Milter-conformant filters may then be centrally configured and composed in an end-user's MTA configuration file.

Possible uses for filters include spam rejection, virus filtering, and content control. In general, Milter seeks to address site-wide filtering concerns in a scalable way. Individual users' mail filtering needs (e.g. sorting messages by subject) are left to client-level programs such as Procmail.

This document is a technical introduction intended for those interested in developing Milter filters. It includes:

Contents


Copyright (c) 2000, 2001, 2003 Proofpoint, Inc. and its suppliers. All rights reserved.
By using this file, you agree to the terms and conditions set forth in the LICENSE.