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SpamAssassin: A practical guide to integration and configuration

You're reading from SpamAssassin: A practical guide to integration and configuration

Product type Book

Published in Sep 2004

Publisher Packt

ISBN-13 9781904811121

Pages 240 pages

Edition 1st Edition

Languages

Concepts

Table of Contents (24) Chapters

SpamAssassin

Credits

About the Author

About the Reviewers

1. Introduction

1. Introducing Spam

2. Spam and Anti-Spam Techniques

3. Open Relays

4. Protecting Email Addresses

5. Detecting Spam

6. Installing SpamAssassin

7. Configuration Files

8. Using SpamAssassin

9. Bayesian Filtering

10. Look and Feel

11. Network Tests

12. Rules

13. Improving Filtering

14. Performance

15. Housekeeping and Reporting

16. Building an Anti-Spam Gateway

17. Email Clients

18. Choosing Other Spam Tools

Glossary

SURBLs

Spam URI Realtime BlockLists are a relatively recent technique and SpamAssassin 3.0 supports a relatively small number of SURBLs. SURBLs are configured much like RBLs. SpamAssassin 2.63 can use a different plug-in, described later. Details on SURBLs can be found at http://www.surbl.org.

The SURBLs are defined in /usr/share/spamassassin/25_uribl.cf. An example definition is shown below:

uridnsbl URIBL_SBL sbl.spamhaus.org. TXT
header URIBL_SBL eval:check_uridnsbl('URIBL_SBL')
describe URIBL_SBL Contains a URL listed in the SBL blocklist
tflags URIBL_SBL net

One set of definitions appears for each SURBL configured.

As with RBLs, the SURBL rules set the tflags to net, to enable timeouts to be used, and to enable the rules to be switched on and off together.

SURBLs are implemented as a SpamAssassin plug-in. Plug-ins allow SpamAssassin to be extended with new types of tests and rules without changing SpamAssassin itself. To be enabled, the plug-in must be loaded. On SpamAssassin version 3...

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