Serving Mail
You are probably used to composing email in a program such as Eudora, Netscape Messenger, or Outlook. These programs are mail clients—for them to work, mail must be served to them by a server program running on the network known generically as a mail transport agent (MTA).
Sendmail is the most widely used Unix MTA. In fact, it is probably the most widely used MTA on any platform. The sendmail program comes bundled with Red Hat Linux 6. If you chose to install the server components when you installed Red Hat Linux 6, it is probably already on your system. Otherwise, you install it from the CD using GnoRPM, as explained in Chapters 2 and 3.
This section shows you how to configure sendmail's basic options (there is not much to it). ...
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