----- Original Message -----
From: "Jason Gurtz" <jason(_at_)tommyk(_dot_)com>
To: <spf-discuss(_at_)v2(_dot_)listbox(_dot_)com>
Sent: Thursday, June 24, 2004 4:50 PM
Subject: Re: [spf-discuss] AOL rejecting hosts with no rDNS?
On 6/24/2004 13:56, Carl Hutzler wrote:
This is our policy and has been in effect for about a year now or more.
Not really wanting to start a flame here but what about people that use
DNS hosting such as provided by Tucows, easyDNS and the like? These DNS
providers don't support PTR records in an easy way and hence a lot of
the smaller businesses may be unfairly targeted by policies such as this
(though it would appear that AOL is fairly responsible about it).
Regards,
~Jason
A valid PTR is not necessarily a *matching* PTR record: it simply provides
an address to contact where someone is responsible for that IP address.
As a matter of DNS policy, the PTR record should point to an A record that
resolves back to the PTR, for a whole stack of reasons. But you can provide
additional arbitrary A records that point to a whole *SET* of IP addresses,
all of which resolve to individual hostname A records that are distinct from
that shared A record. This is quite common for webhosting services and
load-balanced websites.