Installing and Administering Internet Services

118 Chapter 4

Installing and Administering sendmail

This chapter describes sendmail, the Internet Services mail routing

facility. sendmail relays incoming and outgoing mail to the appropriate

programs for delivery and further routing. sendmail allows you to send

mail to and receive mail from other hosts on a local area network or

through a gateway.

This chapter contains the following sections:

• “Deciding Whether to Install sendmail” on page 120

• “Installing sendmail” on page 121

• “Creating sendmail Aliases” on page 128

• “How sendmail Works” on page 135

• “Modifying the Default sendmail Conﬁguration File” on page 147

• “Migrating the sendmail Conﬁguration File” on page 149

• “Security” on page 151

• “Troubleshooting sendmail” on page 152

You cannot use SAM to install, conﬁgure, or enable sendmail.

For more detailed technical and conceptual information about

sendmail, we strongly recommend you see sendmail, 2nd edition, by

Bryan Costales with Eric Allman and Neil Richert, published by O’Reilly

and Associates, Inc. Note that the sendmail, 2nd edition book describes

sendmail version 8.8, and so some conﬁguration options it describes

might not be supported by the sendmail version included with HP-UX

11.0. For information about using sendmail with BIND, we strongly

recommend you see DNS and BIND, by Paul Albitz and Cricket Liu, also

published by O’Reilly and Associates, Inc.

Note that you can get information about the above books (including

retail outlets where you can buy them, as well as how to order them

directly from O’Reilly) by visiting the O’Reilly WWW site:

http://www.ora.com

Once you are at the O’Reilly site, look in the catalog, under the category

“System and Network Administration.” The above books are listed

under “Network Administration.”

You also can visit the WWW site for sendmail:

http://www.sendmail.org