HP-UX Mailing Services Administrator's Guide

Mailing Services Overview
The Sendmail Utility
Chapter 126
The Sendmail Utility
Sendmail acts as a post office, to which all messages can be submitted for
routing. Sendmail interprets both Internet (that is,
user @ domain ) and
UUCP (that is,
host ! user ) styles of addressing. The Sendmail
configuration file controls how the addresses are interpreted. Sendmail
can rewrite message addresses to conform to standards on many common
target networks.
For more technical and conceptual information about Sendmail, HP
recommends that you read Sendmail, 3rd Edition, by Bryan Costales
with Eric Allman, published by O’Reilly and Associates, Inc. Sendmail
discusses Sendmail Version 8.12, and some of its features may not be
supported by Sendmail 8.11.1. You can also refer to the Sendmail 8.13
Companion by Bryan Costales. For information about using Sendmail
with BIND, HP recommends that you read DNS and BIND, by Paul
Albitz and Cricket Liu, also published by O’Reilly and Associates, Inc.
You can get information about the O’Reilly books (availability, how to
order them, and so on) by visiting the O’Reilly Website:
http://www.ora.com
You also can visit the Website for Sendmail:
http://www.sendmail.org
NOTE Sendmail 8.11.1 for HP-UX 11i v2 is an HP implementation of publicly
available Sendmail 8.11.1. HP provides support for the features
documented in this chapter and in the sendmail (1M) manpage.
All occurrences of the term Sendmail in this chapter and “Configuring
and Administering Sendmail” on page 39 refer to Sendmail 8.11.1.
This section discusses the following topics:
• “Message Structure” on page 27
• “How Sendmail Collects Messages” on page 27
• “How Sendmail Routes Messages” on page 27
• “How Sendmail Improves Mail Queue Performance” on page 34