January 2005
Intermediate to advanced
544 pages
23h 44m
English
Content preview from Linux Server Security, Second Edition
Become 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,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.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.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.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.
This is the Title of the Book, eMatter Edition
Copyright © 2007 O’Reilly & Associates, Inc. All rights reserved.
260
|
Chapter 9: Securing Internet Email
Sendmail’s configuration files are kept mainly in /etc/mail, with a few files (usually
aliases, aliases.db,andsendmail.cf) residing one level higher in /etc. /etc/sendmail.cf is
its primary configuration file. /etc/mail contains sendmail.mc, which can be used to
generate /etc/sendmail.cf. /etc/aliases.db, which is generated from the text file /etc/
aliases, contains mappings of username aliases.
There’s one other main repository of Sendmail files, containing its static m4 scripts
(as opposed to the dynamic configuration files in /etc/mail). On Red Hat systems,
this repository is /usr/share/sendmail-cf; on SUSE systems, it’s /usr/share/sendmail;
and on Debian GNU/Linux hosts, it’s /usr/share/sendmail/sendmail.cf. You shouldn’t
need to edit these files.
That’s as much as most of us need to know about how Sendmail is structured.
Which is not to discourage you from seeking greater understanding, for which I rec-
ommend Costales and Allman’s book sendmail (O’Reilly).
Obtaining and Installing Sendmail
I can state with absolute certainty that your Linux distribution of choice includes one
or more packages for Sendmail. Whether it’s presently installed on your system and
is an appropriate version for you to use, however, is another matter.
If you use an
Become 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,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.