cf file, that
entire line is treated as a comment and ignored. For example, the entire following
line is ignored by the sendmail program:
# This is a comment
Besides beginning a line, comments can also follow commands.* That is:
V10/Berkeley # this is another comment
* Before V8 sendmail, comments could follow only three commands: S (rule set), P (priority), and R (rewriting
rule).
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
32 | Chapter 1: Some Basics
1.8.4 A Quick Tour
The other commands in a configuration file tend to be more complex than the version
command you just saw (so complex, in fact, that whole chapters in this book
are dedicated to most of them). Here, we present a quick tour of each command??”
just enoughto give you the flavor of a configuration file but in small enoughbites to
be easily digested.
1.8.4.1 Mail delivery agents
Recall that the sendmail program does not generally deliver mail itself. Instead, it
calls other programs to perform that delivery. The M command defines a mail delivery
agent (a program that delivers the mail). For example, as was previously shown:
Mlocal, P=/usr/lib/mail.local, F=lsDFMAw5:/|@qPSXfmnz9,
S=EnvFromL/HdrFromL, R=EnvToL/HdrToL,
T=DNS/RFC822/SMTP,
A=mail.local -l
This tells sendmail that local mail is to be delivered by using the /usr/lib/mail.
Pages:
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88