Book Image

SpamAssassin: A practical guide to integration and configuration

Book Image

SpamAssassin: A practical guide to integration and configuration

Overview of this book

As a busy administrator, you know Spam is a major distraction in todays network. The effects range from inappropriate content arriving in the mailboxes up to contact email addresses placed on a website being deluged with unsolicited mail, causing valid enquiries and sales leads to be lost and wasting employee time. The perception of the problem of spam is as big as the reality. In response to the growing problem of spam, a number of free and commercial applications and services have been developed to help network administrators and email users combat spam. Its up to you to choose and then get the most out of an antispam solution. Free to use, flexible, and effective, SpamAssassin has become the most popular open source antispam application. Its unique combination of power and flexibility make it the right choice. This book will now help you set up and optimize SpamAssassin for your network.
Table of Contents (24 chapters)
SpamAssassin
Credits
About the Author
About the Reviewers
Introduction
Glossary

Spamming Techniques


Spammers have developed a complex arsenal of techniques for spamming. Important spamming techniques are described in the following sections.

Open Relay Exploitation

An open relay is a computer that allows any user to send email. Spammers use such computers to send spam without the email being traced to its true origin. Open relays are discussed in detail in Chapter 3.

Collecting Email Addresses

Early spammers had to collect email addresses in order to send spam. They use a variety of methods, from collecting email addresses from the Internet and Internet newsgroups to simply guessing email addresses. Email address collection is discussed in detail in Chapter 4.

Hiding Content

Most people can detect spam from the email subject or sender. It is often easy to discard spam emails without even looking at the body. One technique used by spammers is to hide the true content of their emails. Often, the subject of an email is a simple "Hi"; alternatively, an email might appear to...