This chapter
includes a description of how Internet mail works at the protocol level,
and then guides you through the process of setting up a mail server, complete
with spam and virus filtering. In the final section, you learn how to
secure network communications between clients and your mail server
through the use of SSL/TLS (Secure Sockets Layer and Transport Layer
Security) protocols.
The examples in this chapter are based on a Debian GNU/Linux system.
(See Chapter 9 for more information about Debian.) However, much of the
knowledge you gain from setting up a mail server in Debian applies to other
Linux systems as well.
Internet E-Mail??™s Inner Workings
E-mail messages are generated either by an automated process, such as a form
processor on a Web page or an automated notification system, or by an MUA
671
IN THIS CHAPTER
Internet e-mail??™s inner workings
About the system and the
software used
Preparing your system
Installing and configuring the
mail server software
Testing and troubleshooting
Configuring mail clients
Securing communications with
SSL/TLS
Running a Mail Server
(mail user agent) controlled by an end user. Messages are delivered through one of two methods to
the software performing the MTA (mail transfer agent) function on a server:
SMTP??”The Simple Mail Transfer Protocol is a network-based protocol that allows for
transmission of messages between systems.
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