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150476Speter<html> 282486Sbde<head> 321611Swosch<title>Filtering Mail with Sendmail</title> 421611Swosch</head> 521611Swosch<body> 618052Sbde<!-- 736494Sbde$Id: index.html,v 1.10 2001/06/01 00:05:03 ca Exp $ 818052Sbde--> 936494Sbde 1076576Smarkm<h1>Filtering Mail with Sendmail</h1> 1139412Sphk 1279495Sobrien<!-- 1336494Sbde<P><b>Disclaimer</b>: 1476515SbdeThis preliminary API description is provided for review only. This 1569227Sbrianspecification may change based on feedback from reviewers, and does 1636494Sbdenot bind Sendmail to offer this functionality in any release. 1739259Sgibbs--> 1836575Speter 1976515Sbde<h2>Introduction</h2> 2036494Sbde 2136494Sbde<P> 2257461SmarkmSendmail's Content Management API (milter) provides third-party 2336494Sbdeprograms to access mail messages as they are being processed by the 2436575SpeterMail Transfer Agent (MTA), allowing them to examine and modify message 2576515Sbdecontent and meta-information. Filtering policies implemented by 2639259SgibbsMilter-conformant filters may then be centrally configured and 2736494Sbdecomposed in an end-user's MTA configuration file. 2836494Sbde 2936494Sbde<p> 3074535SdesPossible uses for filters include spam rejection, virus 3118052Sbdefiltering, and content control. In general, Milter seeks to address 3276515Sbdesite-wide filtering concerns in a scalable way. Individual users' mail 3336494Sbdefiltering needs (e.g. sorting messages by subject) are left to 3476515Sbdeclient-level programs such as <a href="http://www.procmail.org">Procmail</a>. 3536494Sbde 3636494Sbde<P> 3794280SruThis document is a technical introduction intended for those 3847570Sacheinterested in developing Milter filters. It includes: 3957538Sshin<ul> 4036494Sbde<li>A description of Milter's design goals. 4167523Sarchie 4236575Speter<li>An explanation of Milter application architecture, including 4336575Speterinteractions between the support library and user code, and between 4476576Smarkmfilters and the MTA. 4536494Sbde 4636494Sbde<li>A specification of the C application programming interface. 4736494Sbde<li>An example of a simple Milter filter. 4865916Sache</ul> 4936494Sbde 5036494Sbde<h2>Contents</h2> 5176515Sbde 5290796Sgshapiro<ul> 5390796Sgshapiro<li><a href="design.html">Architecture</a> 5490796Sgshapiro<ul> 5536494Sbde <li>Design Goals 5665916Sache <li>Implementing Filtering Policies 5752251Sbp <li>MTA - Filter communication 5836494Sbde</ul> 5952419Sjulian<li><a href="overview.html">Technical Overview</a> 6036494Sbde<ul> 6136494Sbde <li>Initialization 6242916Sjdp <li>Control flow 6342916Sjdp <li>Multithreading 6442916Sjdp <li>Resource Management 6559770Sbde <li>Signal Handling 6642916Sjdp</ul> 6742916Sjdp<li><a href="api.html">API Documentation</a> 6876576Smarkm<ul> 6942916Sjdp <li>Library Control Functions 7076576Smarkm <li>Data Access Functions 7176576Smarkm <li>Message Modification Functions 7242916Sjdp <li>Callbacks 7376576Smarkm</ul> 7477866Smarkm<li><a href="installation.html">Installation and Configuration</a> 7577866Smarkm<ul> 7676576Smarkm <li>Compiling and Installing Your Filter 7777866Smarkm <li>Configuring Sendmail 7876576Smarkm</ul> 7976576Smarkm<li><a href="sample.html">A Sample Filter</a> 8089705Sru<!-- <li><a href="other.html">Other Sources of Information</a> --> 8194714Sdes</ul> 8289705Sru 8394714Sdes<hr size="1"> 8489705Sru<font size="-1"> 8589705SruCopyright (c) 2000, 2001 Sendmail, Inc. and its suppliers. 8689705SruAll rights reserved. 8742916Sjdp<br> 8889705SruBy using this file, you agree to the terms and conditions set 8942916Sjdpforth in the <a href="LICENSE.txt">LICENSE</a>. 9076515Sbde</font> 9136494Sbde</body> 9236494Sbde</html> 9339020Smarkm