Not Just Another Bogus List
Not Just Another Bogus List (NJABL) was a DNS blacklist.
NJABL maintained a list of known and potential spam sources (open mail relays, open proxies, open form to mail HTTP gateways, dynamic IP pools, and direct spammers) for the purpose of being able to tag or refuse e-mail and thereby block spam from certain sources. NJABL automatically retests only listed open relays every 90 days.
NJABL's dynamic IP list originally came from Dynablock but was maintained independently since Dynablock stopped updating  December 2003. The SORBS dynamic IP list is also a development from Dynablock, but is more aggressively inclusive than NJABL's version.
As of March 1, 2013, NJABL is in the process of being shut down. The DNSBL zones have been emptied. After "the Internet" has had some time to remove NJABL from server configs, the NS's will be pointed off into unallocated space (192.0.2.0/24 TEST-NET-1) to hopefully make the shutdown obvious to those who were slower to notice.
As of April 29, the above mentioned pointing of the DNSBL NS's into 192.0.2.0/24 has been done.
- NJABL.org - Home site of Not Just Another Bogus List project.
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