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.
251
Chapter 9
CHAPTER 9
Securing Internet
Email
Like DNS, email’s importance and ubiquity make it a prime target for vandals,
thieves, and pranksters. Common types of email abuse include the following:
• Eavesdropping confidential data sent via email
• “Mail-bombing” people with bogus messages that fill up their mailboxes or
crash their email servers
• Sending messages with forged sender addresses to impersonate someone else
• Propagating viruses
• Starting chain letters (hoaxes)
• Hijacking the email server itself to launch other types of attacks
• Sending unsolicited commercial email (UCE), a.k.a. “spam”
The scope and severity of these threats are not helped by the complexity of running
Internet email services, including both Mail Transfer Agents (MTAs) and Mail Deliv-
ery Agents (MDAs). Email administration requires a working understanding of the
Simple Mail Transfer Protocol (SMTP) plus your MDA protocol of choice (typically
IMAP or POP3), as well as a mastery of your MTA and MDA applications of choice.
There really aren’t any shortcuts around either requirement (although some MTAs
and MDAs are easier to master than others).
There are a number of MTAs in common use. Sendmail is the oldest and tradition-
ally the most popular. Postfix is a more modular, simpler, and more secure alterna- ...
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.