mail.sendmail news group.
??”Bryan Costales
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
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Chapter 1 CHAPTER 1
Some Basics
We began previous editions of this book with a very long tutorial aimed at those new
to sendmail. In this edition, however, much of that tutorial has been folded into the
chapters that follow, and we present, instead, a brief introductory chapter intended
to get new people started. It begins witha look at some of the basic concepts of email
and the sendmail program. We will show you sendmail??™s basic parts, explore the
three parts of an email message, then demonstrate how to run sendmail by hand. We
finishwithan overview of the roles sendmail plays and of its various modes. Lastly,
we take a preliminary look at its configuration file.
1.1 Email Basics
Imagine yourself withpen and paper, writing a letter to a friend far away. You finish
the letter and sign it, reflect on what you??™ve written, then tuck the letter into an envelope.
You put your friend??™s address on the front, your return address in the lefthand
corner, and a stamp in the righthand corner, and the letter is ready for mailing. Electronic
mail (email for short) is prepared in much the same way, but a computer is
used instead of pen and paper.
The post office transports real letters in real envelopes, whereas sendmail transports
electronic letters in electronic envelopes.
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