You can easily manage and operate Postfix without understanding everything about how it works. If you're ready to dive right in, you can skip this section and start at the beginning of the next chapter. It might be difficult to digest all of the material here if you don't have much experience with Postfix yet, but this chapter will give you an overview of the various pieces, which might come in handy as you start to work with Postfix. Later, after you have more experience with Postfix, you might want to return to this chapter to try to absorb more of the details.
Introduction
Prerequisites
Postfix Architecture
General Configuration and Administration
Queue Management
Email and DNS
Local Delivery and POP/IMAP
Hosting Multiple Domains
Mail Relaying
Mailing Lists
Blocking Unsolicited Bulk Email
SASL Authentication
Transport Layer Security
Content Filtering
External Databases
Appendix A. Configuration Parameters
Appendix B. Postfix Commands
Appendix C. Compiling and Installing Postfix
Appendix D. Frequently Asked Questions