The ‘NJABL’ (Not Just Another Bogus List) has started the process of shutting down. This list is used by many spam filtering services and email systems to form part of a score or sometimes to outright block email based upon its source ip address. It is highly recommended that all email servers should stop using this system as soon as possible. Currently the zones have been emptied, however when the system actually gets switched off, performance on email servers as they try to connect constantly to the non existent service will suffer. Spamassassin – one the most popular open source spam fighting tools still has NJABL it its current version and its current updates so administrators using install and forget anti-spam should investigate the issue further. There are details on the Spamassassin wiki on how to ‘retire’ an individual DNSBL.
More details about NJABL and its shutdown can be found here: www.njabl.org
Further information on Gconnect’s own ‘Gscanner’ anti-spam system can be found here: www.gconnect.net/anti-virus-anti-spam.php
=== UPDATE ===
The Spamassassin update channel has now retired the tests, so if you are updating regularly, then there is no need to do anything else.