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Date: Wed, 4 Feb 1998 14:19:50 -0800 (PST)
From: Shawn Ramsey <shawn@luke.cpl.net>
cc: chas <panda@peace.com.my>, questions@FreeBSD.ORG
Subject: Re: why must POP clients have a resolvable IP ? what about dynamic  IPs ?
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> It doesnt have to do with dynamic IPs - it has to do with that ISP failing
> to set up proper in-addr.arpa in his name service.

You could fix this by putting the users that do this in your own DNS
server. I have done this on occasion, but most ISPs are competenent enough
to do reverse DNS.