From: Gary Mort (gmlugsaplings.us)
Date: Tue Jul 03 2007 - 16:52:02 CDT

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Joey wrote:
> Is there an RFC requiring mail servers to have forward & reverse DNS ?
>
> I need to link it in to messages as we tell clients why their messages are
> being rejected, but I couldn't find it.
>
> I can't simply say your configured wrong because I said so.
>

Their required to have to have both, but both do not have to be from the
same domain, ie:
mx.mydomain.com --> 172.16.0.1
172.16.0.1 --> dynamic.myisp.net
(ok, technically dynamic.mysip.net should point to 172.16.0.1 also)

However, if you want your email delivered to the major providers, than
you make sure the reverse dns record matches the mx servers A record.

And the reason for that is because you say so based on experience with
the major email providers. The major providers are under no obligation
to tell you what their criteria for spam is. But if YOU want your email
to reach them, you play ball.

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