1. Chapter 1 Introduction

   1. Postfix Origins and Philosophy

   2. Email and the Internet

   3. The Role of Postfix

   4. Postfix Security

   5. Additional Information and How to Obtain Postfix

2. Chapter 2 Prerequisites

   1. Unix Topics

   2. Email Topics

3. Chapter 3 Postfix Architecture

   1. Postfix Components

   2. How Messages Enter the Postfix System

   3. The Postfix Queue

   4. Mail Delivery

   5. Tracing a Message Through Postfix

4. Chapter 4 General Configuration and Administration

   1. Starting Postfix the First Time

   2. Configuration Files

   3. Important Configuration Considerations

   4. Administration

   5. master.cf

   6. Receiving Limits

   7. Rewriting Addresses

   8. chroot

   9. Documentation

5. Chapter 5 Queue Management

   1. How qmgr Works

   2. Queue Tools

6. Chapter 6 Email and DNS

   1. DNS Overview

   2. Email Routing

   3. Postfix and DNS

   4. Common Problems

7. Chapter 7 Local Delivery and POP/IMAP

   1. Postfix Delivery Transports

   2. Message Store Formats

   3. Local Delivery

   4. POP and IMAP

   5. Local Mail Transfer Protocol

8. Chapter 8 Hosting Multiple Domains

   1. Shared Domains with System Accounts

   2. Separate Domains with System Accounts

   3. Separate Domains with Virtual Accounts

   4. Separate Message Store

   5. Delivery to Commands

9. Chapter 9 Mail Relaying

   1. Backup MX

   2. Transport Maps

   3. Inbound Mail Gateway

   4. Outbound Mail Relay

   5. UUCP, Fax, and Other Deliveries

10. Chapter 10 Mailing Lists

    1. Simple Mailing Lists

    2. Mailing-List Managers

11. Chapter 11 Blocking Unsolicited Bulk Email

    1. The Nature of Spam

    2. The Problem of Spam

    3. Open Relays

    4. Spam Detection

    5. Anti-Spam Actions

    6. Postfix Configuration

    7. Client-Detection Rules

    8. Strict Syntax Parameters

    9. Content-Checking

    10. Customized Restriction Classes

    11. Postfix Anti-Spam Example

12. Chapter 12 SASL Authentication

    1. SASL Overview

    2. Postfix and SASL

    3. Configuring Postfix for SASL

    4. Testing Your Authentication Configuration

    5. SMTP Client Authentication

13. Chapter 13 Transport Layer Security

    1. Postfix and TLS

    2. TLS Certificates

14. Chapter 14 Content Filtering

    1. Command-Based Filtering

    2. Daemon-Based Filtering

    3. Other Considerations

15. Chapter 15 External Databases

    1. MySQL

    2. LDAP

1. Appendix A Configuration Parameters

   1. Postfix Parameter Reference

2. Appendix B Postfix Commands

3. Appendix C Compiling and Installing Postfix

   1. Obtaining Postfix

   2. Postfix Compiling Primer

   3. Building Postfix

   4. Installation

   5. Compiling Add-on Packages

   6. Common Problems

   7. Wrapping Things Up

4. Appendix D Frequently Asked Questions

5. Colophon

Our look is the result of reader comments, our own experimentation, and feedback from distribution channels. Distinctive covers complement our distinctive approach to technical topics, breathing personality and life into potentially dry subjects. The animal on the cover of Postfix: The Definitive Guide is a dove. Doves belong to the class Aves (birds) and the order Columbiformes (doves and pigeons), to which the now-extinct dodo bird (Raphus cucullatus) also belonged. Their family, Columbidae, includes over 300 species of pigeons and doves, including the common rock dove or feral pigeon (Columba livia).

In 1679, the French astronomer Augustin Royer discovered the dove-shaped constellation Columba. A constellation in the southern hemisphere, located near Puppis and Caelum, Columba's stars were originally part of the constellation Canis Major. Reg Aubry was the production editor and copyeditor, and Matt Hutchinson was the proofreader for Postfix: The Definitive Guide. Colleen Gorman and Claire Cloutier provided quality control. Mary Agner provided production assistance. Ellen Troutman-Zaig wrote the index.

Ellie Volckhausen designed the cover of this book, based on a series design by Edie Freedman. The cover image is an original illustration created by Susan Hart. Emma Colby produced the cover layout with QuarkXPress 4.1 using Adobe's ITC Garamond font.

David Futato designed the interior layout. This book was converted by Joe Wizda to FrameMaker 5.5.6 with a format conversion tool created by Erik Ray, Jason McIntosh, Neil Walls, and Mike Sierra that uses Perl and XML technologies. The text font is Linotype Birka; the heading font is Adobe Myriad Condensed; and the code font is LucasFont's TheSans Mono Condensed. The illustrations that appear in the book were produced by Robert Romano and Jessamyn Read, using Macromedia FreeHand 9 and Adobe Photoshop 6. The tip and warning icons were drawn by Christopher Bing. This colophon was written by Leanne Soylemez and Reg Aubry.