must not be used for mail filtering

Mark Jeftovic markjr at
Mon May 29 15:56:48 UTC 2006 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 
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 
zone for reasons which have absolutely nothing to do with email and 
simply for inter-provider communications between the members.

In short, using on any MTA is an act of mind-numbing 
recklessness. Don't do it.

Thank you for your time.


Mark Jeftovic <markjr at>
Founder & President, easyDNS Technologies Inc.
ph. +1-(416)-535-8672 ext 225
fx. +1-(866) 273-2892

More information about the NANOG mailing list