McDonald - SpamAssassin
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Abstract: Overview of SpamAssassin: A practical guide to integration and configuration Implement the right antispam solution for your network and your business requirements Learn how to detect and prevent spam Optimize SpamAssassin for all major mail servers and clients Discover how to use SpamAssassin as a service In Detail 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. Spam has become a serious problem for businesses, wasting employees time and costing millions of dollars. To combat this growing problem, a number of applications and services have been developed, and SpamAssassin is one of the most effective and popular open source solutions. 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. As a system administrator, its down to you to implement, configure, and adapt SpamAssassin to fight the Spam War. Fortunately, in SpamAssassin you chose well. Its power and flexibility make it a potent tool. However you also know that any flexible application is only as good as how its set up and configured. This book is a comprehensive guide to the features, options, and implementation strategies you need to get the most of out SpamAssassin. Downloading the example code for this book. You can download the example code files for all Packt books you have purchased from your account at http://www.PacktPub.com. If you purchased this book elsewhere, you can visit http://www.PacktPub.com/support and register to have t
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Copyright 2004 Packt Publishing
All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.
Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the authors, Packt Publishing, nor its dealers or distributors will be held liable for any damages caused or alleged to be caused either directly or indirectly by this book.
Packt Publishing has endeavored to provide trademark information about all the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.
First edition: September 2004
Published by Packt Publishing Ltd. 32 Lincoln Road Olton Birmingham, B27 6PA, UK.
ISBN 1-904811-12-4
www.packtpub.com
Cover Design by www.visionwt.com
Author
Alistair McDonald
Additional Material
Chris Santerre
Technical Reviewers
Kevin Peuhkurinen
Chris Santerre
Commissioning Editor
Louay Fatoohi
Technical Editors*
Deepa Aswani
Ashutosh Pande
Layout*
Ashutosh Pande
Indexers*
Niranjan Jahagirdar
Ashutosh Pande
Proofreader
Chris Smith
Cover Designer
Helen Wood
* Services Provided by Editorialindia.com
Alistair McDonald is the founder and Managing Director of InRevo Ltd, an IT consultancy based in Berkshire, UK. He worked for several large corporations before founding InRevo in 1994. The company offers security, email, and other IT consultancy, as well as bespoke development.
Alistair is a developer specializing in C++ and Perl. When first introduced to Perl, he described it as "a whole new level of flexibility". Alistair got involved with the role of email administrator for one of InRevos clients, and subsequently honed his skills setting up servers for InRevo.
Alistair lists his favorite open-source projects as GNU Emacs, the Linux kernel, the Gentoo Linux distribution, the Perl language, SpamAssassin, and Postfix. He is also a big fan of xplanet and xscreensaver for eye candy.
Alistair is very much a family man, and enjoys spending time with his wife and two children in and around Berkshire, where they have lived for the past ten years.
I can recall getting my first spam email. This was in the mid nineties, when CompuServe provided Internet email addresses for the first time. I had heard of spam, but not experienced it. Strangely, that first spam made me feel that Id come of age in the Internet, but the second, third and fourth spams soon made me realize what an inconvenience spam was. Back then, I did not realize how much spam would affect the Internet, and how much effort would be put into solving it. I guarded future email addresses until I started using SpamAssassin.
I hope that this book assists fellow system administrators to install and configure SpamAssassin. It really is a great solution to spam and takes very little time to set up.
Writing this book has not been a solo effort, and several people deserve special mentions.
First, my wife Louise, who has put in many long nights critically examining drafts and improving my use of English, while single-handedly bringing up two very lively children. Despite her attempts to eradicate all commas from the text, one or two may remain.
Several friends and colleagues have commented on draft chapters and contributed ideas and inspiration. I would like to take this opportunity to thank them publicly for their efforts. They are: Paul Serjeant, Ian Haycox, Colin Jenkins, and Jamie OShaughnessey.
During the writing of this book, I had the misfortune to spend much of my time away from home. This was made bearable as much of the time was spent with my parents. Id like to thank them for looking after me so well, and Id also like to apologize for being such an appalling and antisocial house guest at times.
Of course, there are many more people to thank. All the SpamAssassin developers, past and present, should be congratulated for creating such an effective tool. Their work is based on the many developers of the Perl language, another great free software project. Hats off to all of you for your hard work and ingenuity.
Finally, a big thank you to the Trade Router team, for all their inspirational comments. Keep having five a day!
I wrote this book on a Dell laptop running Gentoo Linux. I used vmware to install a total of seven different virtual machines for testingfour separate Gentoo configurations for Sendmail, Postfix, Exim, and Gmail, a Windows 2000 installation, a RedHat 9 installation, and a Debian installation, installed from the wonderful Knoppix CD.
This book is dedicated to my children, Imogen and Keir So lively during the day, and so peaceful at night.
Kevin Peuhkurinen lives in rural Ontario and works as a network security analyst for a financial institution in Toronto, where his incessant Open Source evangelism often annoys his co-workers. When not fighting spam he likes to ride large motorcycles and go lure coursing with his two Irish Wolfhounds. He can be reached on the SpamAssassin-users mailing list and is always happy to help out others.
Chris Santerre is a System Administrator working in Providence, Rhode Island. He started the SpamAssassin Rule Emporium (SARE) at www.rulesemporium.com, which hosts custom rulesets for SpamAssassin. He created a ruleset called BigEvil that looks for known spammer URLs in an email. He is also a content provider for www.SURBL.org. Chris continues to work with the SARE ninjas to update SARE rules for SpamAssassin, and keep it as fresh as possible. He also encourages everyone to go see a live professional ice hockey game!
SpamAssassin is an open-source spam detector. It is considered the best of breed, and is used by many large organizations and also as the basis for commercial services and products.
SpamAssassin is free to download, install, and use, and is very customizable, configurable, and scalable to large architectures. It can be installed in one afternoon, but rewards further time spent on improving the detection rate.
This book provides a complete guide to the installation, configuration, and customization of SpamAssassin. It also discusses the history of Spam and the various techniques used to combat it. It includes detailed instructions for the most popular Mail Transport Agents (MTAs): Sendmail, Postfix, Exim, and Qmail. It also includes details on installing SpamAssassin on Windows, and adding a separate spam filter to an existing email infrastructure, such as Microsoft Exchange.
Most spam detection systems use only one or two methods of detecting spam. SpamAssassin uses many, and is extensible, allowing users to develop their own rules to identify spam. New techniques to identify spam, such as Sender Policy Framework (SPF) can be added to SpamAssassin by developing them as modules. Users or System Administrators can configure almost every aspect of SpamAssassin, leading to exceptional success rates in detecting spam.
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