Any FYI from njabl.org that they’re shutting down their DNSBL.
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.
So grep through your mailserver configs for “dnsbl.njabl.org” and comment it out lest any issues pop up.