North American Network Operators Group

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Re: question on ptr rr

  • From: Randy Bush
  • Date: Sat Feb 07 11:10:20 2004

> There are quite a few sites (including the mailserver, and, 
> on a case by case basis, even AOL) that do refuse mail from IPs without 
> rDNS, but turning on a "must have rDNS or you can't email us" setting 
> will definitely result in a non trivial amount of false positives.

but, i suspect that more and more of the world will go that
way, maybe slowly.  so how does one judge when a site which
hosts public lists can do so without causing serious
discomfort for folk?  is there some objective measure, or do
we all just shoot in the dark?