SpamAssassin

Spam is a growing problem. Everyone has more of it than they want, and most system administrators are looking for solutions, any solutions, that will cut spam without greatly affecting cost or impacting legitimate email. What they need is SpamAssassin (SA), the leading open source spam-fighting tool. Our concise guide is the only published resource available for this free and remarkably effective product. SpamAssassin is a small price to pay for such a big problem.

Alan Schwartz, Ph.D. is an assistant professor of clinical decision making in the Departments of Medical Education and Pediatrics at the University of Illinois at Chicago. He is also the author of Managing Mailing Lists and the coauthor of Stopping Spam (both from O'Reilly). He serves as a consultant on Unix system administration for several ISPs. In his spare time, he develops and maintains the PennMUSH MUD server and brews beer and mead with his wife, with whom he also develops and maintains their son. Turn-ons for Alan include sailing, programming in Perl, playing duplicate bridge, and drinking Anchor Porter. Turn-offs include spam and watery American lagers.

Preface

vii

1. Introducing SpamAssassin

1

(8)

How SpamAssassin Works

4

(1)

Organization of SpamAssassin

4

(2)

Mailers and SpamAssassin

6

(2)

The Politics of Scanning

8

(1)

2. SpamAssassin Basics

9

(24)

Prerequisites

9

(1)

Building SpamAssassin

10

(10)

Invoking SpamAssassin with procmail

20

(1)

Using spamc/spamd

21

(7)

Invoking SpamAssassin in a Perl Script

28

(2)

SpamAssassin and the End User

30

(3)

3. SpamAssassin Rules

33

(29)

The Anatomy of a Test

33

(2)

Modifying the Score of a Test

35

(6)

Writing Your Own Tests

41

(9)

The Built-in Tests

50

(6)

Whitelists and Blacklists

56

(6)

4. SpamAssassin as a Learning System

62

(19)

Autowhitelisting

62

(6)

Bayesian Filtering

68

(13)

5. Integrating SpamAssassin with sendmail

81

(26)

Spam-Checking at Delivery

81

(1)

Spam-Checking During SMTP

82

(20)

Building a Spam-Checking Gateway

102

(5)

6. Integrating SpamAssassin with Postfix

107

(28)

Postfix Architecture

107

(1)

Spam-Checking During Local Delivery

108

(1)

Spam-Checking All Incoming Mail

109

(6)

Building a Spam-Checking Gateway

115

(20)

7. Integrating SpamAssassin with qmail

135

(14)

qmail Architecture

135

(1)

Spam-Checking During Local Delivery

136

(1)

Spam-Checking All Incoming Mail

137

(3)

Building a Spam-Checking Gateway

140

(9)

8. Integrating SpamAssassin with Exim

149

(28)

Spam-Checking via procmail

150

(1)

Spam-Checking All Incoming Mail

151

(1)

Using Routers and Transports

152

(6)

Using exiscan

158

(3)

Using sa-exim

161

(13)

Building a Spam-Checking Gateway

174

(3)

9. Using SpamAssassin as a Proxy

177

(10)

Using Pop3proxy

178

(5)

Using SAproxy Pro

183

(4)

Appendix

187

(4)

Index

191

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Summary

Author Biography

Table of Contents

Supplemental Materials