SpamAssassin by McDonald Alistair

Author:McDonald, Alistair [Alistair McDonald]
Language: eng
Format: epub
Publisher: Packt Publishing Ltd

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 under the rbl_timeout entry. The second reason for grouping all the tests together is so they can be switched on or off with a single configuration directive.

To disable RBL tests, set skip_rbl_checks to 1 in etc/mail/spamassassin/local.cf for a site-wide change, or ~/.spamassassin/user_prefs for a change that influences only one user. To enable RBL tests, set skip_rbl_checks to 0.

skip_rbl_checks 0 rbl_timeout 15

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