December 2003
Beginner
278 pages
10h 47m
English
Content preview from Postfix: The Definitive GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Configuration Files
The directory /etc/postfix contains Postfix configuration
files. The two most important files used in the configuration of Postfix
are master.cf and main.cf. These
files should be owned by, and only writable by, the root user. They should be readable by
everyone. Whenever you make changes to these files, you have to reload
Postfix for your changes to go into effect:[1]
# postfix reloadThe master daemon is the overall process that controls other Postfix daemons for mail handling. The master daemon uses the master.cf file for its configuration information. The master.cf file contains a line for each Postfix service or transport. Each line has columns that specify how each program should run as part of the overall Postfix system. See Chapter 3 for information on Postfix’s architecture and how various components interact with each other. In many installations, you will never have to change the default master.cf file. See Section 4.5 later in the chapter for information on when and how to make changes to master.cf.
The main.cf Configuration File
The main.cf file is the core of your Postfix configuration. Nearly all configuration changes occur in this file. The default main.cf file lists only a portion of the nearly 300 Postfix parameters. Most Postfix parameters do not need to be changed, but the flexibility is there when it’s required. All Postfix parameters are listed and described in the various sample configuration files. The sample files are located in the ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.