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Part I |
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Part I |
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The first part of this book is a tutorial intended mainly for those with a limited understanding of sendmail . Its aim is to provide the novice with a general introduction to V8 sendmail .
Covers mail transfer agents and mail user agents, explains why sendmail is so complex, gives an overview of sendmail , and describes the differences between the header, body, and envelope of a mail message.
Shows where and how to get the source for V8 sendmail and how to compile and test a working binary.
Shows how sendmail processes aliases, queues messages for later transmission, does local and remote delivery, and runs in the background listening for incoming mail.
Illustrates use of the
-b
(become),
-v
(verbose), and
-d
(debugging) command-line switches.
Provides a quick overview of all the commands found in the sendmail.cf file.
Describes the hub approach and shows how
M
(delivery agent) commands can be used to forward mail to a central hub machine.
Shows how text can be automatically propagated throughout the configuration file.
Describes a fictional network, then uses addresses in that network to illustrate rules and rule sets.
Shows how rules in rule set 0 can select delivery agents and handle errors.
Explains rule set 3, the first to rewrite all addresses.
Develops an
S=
rule set to make all mail appear as though it comes from the hub machine.
Shows how multiple values can be referenced with a single expression in the LHS of rules.
Explains how options "tune" sendmail and offers a few suggestions.
Completes the
client.cf
file by adding
H
,
P
, and
T
commands.
Shows how to install the client.cf file as your working configuration file.
Shows how m4 can be used to produce a client.cf file called nullclient .
Concludes with a tour of a hub's major sendmail.cf file.
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| Acknowledgments |
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1. Introduction |