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<TITLE>Filtering Mail with Sendmail</TITLE>
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$Id: index.html,v 1.13 2006/08/08 20:55:57 ca Exp $
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<H1>Filtering Mail with Sendmail</H1>
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<!--
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<P><B>Disclaimer</B>:
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This preliminary API description is provided for review only. This
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specification may change based on feedback from reviewers, and does
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not bind Sendmail to offer this functionality in any release.
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-->
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<H2>Introduction</H2>
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<P>
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Sendmail's Content Management API (milter) provides third-party
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programs to access mail messages as they are being processed by the
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Mail Transfer Agent (MTA), allowing them to examine and modify message
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content and meta-information. Filtering policies implemented by
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Milter-conformant filters may then be centrally configured and
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composed in an end-user's MTA configuration file.
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<P>
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Possible uses for filters include spam rejection, virus
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filtering, and content control. In general, Milter seeks to address
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site-wide filtering concerns in a scalable way. Individual users' mail
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filtering needs (e.g. sorting messages by subject) are left to
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client-level programs such as <A href="http://www.procmail.org">Procmail</A>.
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<P>
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This document is a technical introduction intended for those
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interested in developing Milter filters. It includes:
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<UL>
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<LI>A description of Milter's design goals.
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<LI>An explanation of Milter application architecture, including
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interactions between the support library and user code, and between
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filters and the MTA.
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<LI>A specification of the C application programming interface.
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<LI>An example of a simple Milter filter.
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</UL>
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<H2>Contents</H2>
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<UL>
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<LI><A href="design.html">Architecture</A>
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<UL>
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<LI>Design Goals
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<LI>Implementing Filtering Policies
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<LI>MTA - Filter communication
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</UL>
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<LI><A href="overview.html">Technical Overview</A>
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<UL>
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<LI>Initialization
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<LI>Control flow
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<LI>Multithreading
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<LI>Resource Management
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<LI>Signal Handling
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</UL>
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<LI><A href="api.html">API Documentation</A>
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<UL>
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<LI>Library Control Functions
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<LI>Data Access Functions
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<LI>Message Modification Functions
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<LI>Callbacks
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</UL>
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<LI><A href="installation.html">Installation and Configuration</A>
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<UL>
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<LI>Compiling and Installing Your Filter
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<LI>Configuring Sendmail
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</UL>
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<LI><A href="sample.html">A Sample Filter</A>
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<!-- <LI><A href="other.html">Other Sources of Information</A> -->
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</UL>
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<HR size="1">
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<FONT size="-1">
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Copyright (c) 2000, 2001, 2003 Sendmail, Inc. and its suppliers.
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All rights reserved.
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<BR>
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By using this file, you agree to the terms and conditions set
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forth in the LICENSE.
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</FONT>
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