Exim The Mail Transfer Agent.pdf

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Exim
The Mail Transfer Agent
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,Title.10724 Page 3 Tuesday, October 9, 2001 9:25 AM
Exim
The Mail Transfer Agent
Philip Hazel
Beijing • Cambridge • Farnham • Köln • Paris • Sebastopol • Taipei • Tokyo
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,Copyright.10561 Page 1 Tuesday, October 9, 2001 9:25 AM
Exim: The Mail Transfer Agent
by Philip Hazel
Copyright © 2001 O’Reilly & Associates, Inc. All rights reserved.
Printed in the United States of America.
Published by O’Reilly & Associates, Inc., 101 Morris Street, Sebastopol, CA 95472.
Editor: Andy Oram
Production Editor: Mary Brady
Cover Designer: Ellie Volckhausen
Printing History:
June 2001:
First Edition.
Nutshell Handbook, the Nutshell Handbook logo, and the O’Reilly logo are registered
trademarks of O’Reilly & Associates, Inc. Many of the designations used by manufacturers
and sellers to distinguish their products are claimed as trademarks. Where those designations
appear in this book, and O’Reilly & Associates, Inc. was aware of a trademark claim, the
designations have been printed in caps or initial caps. The association between the image of
an aye-aye and Exim is a trademark of O’Reilly & Associates, Inc.
While every precaution has been taken in the preparation of this book, the publisher assumes
no responsibility for errors or omissions, or for damages resulting from the use of the
information contained herein.
Library of Congress Cataloging-in-Publication Data
Hazel, Philip
Exim: the mail transfer agent/by Philip Hazel p.cm.
ISBN 0-596-00098-7
1. Exim (Computer program) 2. Email--Computer programs I. Title
TK5105.73 .H39 2001
004.692--dc21
2001036079
[DS]
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Table of Contents
Preface .................................................................................................................. xiii
1. Introduction .................................................................................................. 1
2. How Internet Mail Works ......................................................................... 5
Different Types of MTA .................................................................................... 10
Internet Message Standards ............................................................................. 11
RFC 822 Message Format ................................................................................. 11
The Message ‘‘On the Wire’’ ............................................................................ 13
Summary of the SMTP Protocol ....................................................................... 15
Forgery .............................................................................................................. 18
Authentication and Encryption ........................................................................ 18
Routing a Message ............................................................................................ 18
Checking Incoming Mail .................................................................................. 19
Overview of the DNS ....................................................................................... 21
DNS Records Used for Mail Routing ............................................................... 24
Related DNS Records ....................................................................................... 25
Common DNS Errors ........................................................................................ 27
Role of the Postmaster ..................................................................................... 29
3. Exim Overview .......................................................................................... 30
Exim Philosophy ............................................................................................... 30
Exim’s Queue ................................................................................................... 31
Receiving and Delivering Messages ................................................................ 31
Exim Processes ................................................................................................. 32
v
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