The expression
:include: tells sendmail to read a specific file and to use the names in that file as
the list of recipients.
The nobody: line shows how a name can be aliased to a file. The mail message is
appended to the file. The /dev/null file listed here is a special one. That file is an
empty hole into which the mail message simply vanishes.
The ftphelp: line shows how a name can be replaced by the name of a program. The
| character causes sendmail to pipe the mail message through the program whose full
* The name postmaster is required by RFC2822, so resist the temptation to redefine it as postperson or sysop.
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
14 | Chapter 1: Some Basics
pathname follows (in this case, we specified the full pathname as /usr/local/bin/sendhelp).
The aliases file can become very complex. It can be used to solve many special mail
problems. The aliases file is covered in greater detail in Chapter 12 on page 460.
1.6.3 Role in Queue Management
A mail message can be temporarily undeliverable for a wide variety of reasons, such
as when a remote machine is down or has a temporary disk problem. To ensure that
sucha message is eventually delivered, sendmail stores it in a queue directory until
the message can be delivered successfully.
Pages:
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60