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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

RBLs

A number of RBLs are enabled with the default configuration of SpamAssassin. These are defined in /usr/share/spamassassin/20_dnsbl_tests.cf. An example definition is shown here:

header RCVD_IN_NJABL eval:check_rbl('njabl', 'dnsbl.njabl.org.')
describe RCVD_IN_NJABL Received via a relay in dnsbl.njabl.org
tflags RCVD_IN_NJABL net

One set of definitions appears for each RBL configured. Rule definitions are explained in more detail in Chapter 12.

All the rules include a line that sets tflags to net. This groups the rules as network tests, and allows SpamAssassin to treat them as a group. There are two main reasons for this. The first is that network tests may take a long time to complete, especially at busy times. SpamAssassin uses a timeout for network tests, but it also applies this timeout in a progressive manner. If most of the network tests have completed, SpamAssassin will not wait for the last tests to complete. Specific details are given in the Mail::SpamAssassin::Conf main page...

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