Re: Domain does not resolve

David Cary Hart wrote the following on 10/06/04 02:47 :

>On Tue, 2004-10-05 at 19:59, /dev/rob0 wrote:
> =20
>
>>On Tuesday 05 October 2004 18:13, strandvagen@mac.com wrote:
>> =20
>>
>>>Hi. I have a sending mail problem to at least 2 mail servers. We=B4ve
>>>send a lot of mails but to two mail servers we cant. They reply with
>>>"sender domain must resolve" or "Domain of sender address
>>>test@recommended.se does not resolve (in reply to MAIL FROM command)"
>>> =20
>>>
>>But the domain DOES resolve, which indicates DNS failure or=20
>>misconfiguration on the other end.
>>
>> =20
>>
>
>Could the problem be that the reverse pointer for 81.216.64.146 does not
>resolve?
>
> =20
>

I'm not sure, the error message explicitly says that the domain does not
resolve.

I'm stepping in because I'm witnessing the very same problem for some
domains we are hosting. There are some DNS servers that can't resolve
these and I don't know why.
For example inet6.fr (my employer's domain) should be easily resolvable
(for ref, DNS are 62.210.153.201 and 62.210.153.202) but out of the 3
mail servers listed at http://vger.kernel.org/mxverify.html
only the last can get a response for the MX servers.

We have access to our ISP DNS server that can't answer a simple "host -t
soa inet6.fr <server>" command but can "host -t soa ibm.com <server>"
and whatever else I can think of.

I had at least one other DNS admin reporting a problem accessing whole
DNS zones hosted in France (like ours).

Anyone else having messages in the mail queue with dest MX answering
with "non resolvable domain" ?

BTW how do you configure postfix to send a (configurable ?) warning
message to senders when the destination is temporarily refusing the
message ? Some people are annoyed when they only get the "message
refused" 5 days later...

Best regards,

Lionel.