1. I could not find a definite answer to my question on this. For ptr records (reverse dns), it is required that each IP has one unique domain or can it be one domain for multiple IP's? 2. Is njabl.org officially closed as a blacklist RBL? I get this: "IP" is listed as a spam source in dnsbl.njabl.org. http://njabl.org/remove.html This form will not let you remove direct spam sources, dial-up ranges, multi-stage open relays, or dynablock.njabl.org listings. Then, http://njabl.org/dynablock.html So njabl.org is no longer relevant correct??? I even emailed them at firstname.lastname@example.org twice the past two weeks, never received a reply.