I used http://rfc-clueless.org/request/removal to request removal of the "postmaster" listing for FQDN balug.org, which indirectly caused the listing of lists.balug.org. The database entry shown at http://rfc-clueless.org/lookup/balug.org says that this was an entry on 2012-09-27 17:27:28, and was imported from Derek Balling's original postmaster.rfc-ignorant.org DNSBL, for which rfc-clueless.org is a replacement created when Balling's DNSBL went away. http://rfc-clueless.org/pages/removal_process says "You may only request removal from a given list once within a seven-day period".