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in.dnsbl.org must not be used for mail filtering
in.dnsbl.org was created several years ago for commercial DNS providers to share information about problem domains and to offer a mechanism to prevent abusers from hopping from DNS provider to provider.
Under no circumstances should it be used by any MTA for mail filtering in any capacity whatsoever. Absolutely no vetting goes into in.dnsbl.org listing and domains can get listed for internal reasons which are purely meaningless in an email context.
Over the years some big name domains have wound up in the in.dnsbl.org zone for reasons which have absolutely nothing to do with email and simply for inter-provider communications between the DNSBL.org members.
In short, using in.dnsbl.org on any MTA is an act of mind-numbing recklessness. Don't do it.
Thank you for your time.
Mark Jeftovic <[email protected]>
Founder & President, easyDNS Technologies Inc.
ph. +1-(416)-535-8672 ext 225
fx. +1-(866) 273-2892