From: mouss (mlist.onlyfree.fr)
Date: Tue Jul 03 2007 - 17:31:06 CDT

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Gary Mort wrote:
> 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
nobody cares of this. when you connect to a server, it sees your IP.
> 172.16.0.1 --> dynamic.myisp.net
> (ok, technically dynamic.mysip.net should point to 172.16.0.1 also)

not "technically" or "also", it should. period. If it does not, then the
name is irrelevant as it may not be trusted (If I manage the zone for
172.16.0.1, I can return "monica.whitehouse.gov". would you trust this?).

>
> 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.

the MX has nothing to do when sending email. the MX is for _receiving_
mail.

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