Chapter 1 through Chapter 3 provide background information on Postfix and email, Chapter 4 through Chapter 7 discuss general aspects of running a Postfix server, and Chapter 8 through Chapter 15 each present a specific topic that you may or may not need, depending on how you use Postfix:
Introduces Postfix and some general email concepts. Also discusses some of the design decisions that went into Postfix.
Covers required topics for understanding other concepts in the book. Anyone with a basic understanding of Unix and email can safely skip this chapter.
Explains the pieces of the modular architecture of Postfix and how Postfix handles email messages.
Covers a wide range of topics for configuring and managing a Postfix server.
Explains how the Postfix queue manager works, and presents the tools used to work with the queue.
Discusses how DNS is used for email routing. Presents considerations for configuring DNS to work with Postfix.
Covers how Postfix makes local deliveries and how it operates in conjunction with POP and IMAP servers.
Discusses using Postfix to receive email for virtual domains.
Discusses operating Postfix as a mail relay or gateway system.
Discusses setting up mailing lists in Postfix, and using Postfix with mailing-list managers. Provides examples with Majordomo and Mailman.
Discusses Postfix controls for blocking unwanted mail messages.
Covers using SASL libraries to provide SMTP authentication for clients to relay messages through your Postfix server.
Covers using the TLS patch to provide encrypted communications between clients and your Postfix server.
Discusses setting up external content filters with Postfix.
Covers using external data sources for Postfix lookup tables.
Presents an alphabetical listing of Postfix configuration parameters.
Presents a list, with brief explanations, of the command-line utilities that come with Postfix.
Discusses compiling and installing Postfix from source files.
Presents a list of frequently asked questions about Postfix.