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Re: [dmarc-ietf] Draft 10 notes: NXDOMAIN

Douglas Foster <dougfoster.emailstandards@gmail.com> Tue, 28 June 2022 00:37 UTC

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From: Douglas Foster <dougfoster.emailstandards@gmail.com>
Date: Mon, 27 Jun 2022 20:36:55 -0400
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To: Todd Herr <todd.herr@valimail.com>
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Subject: Re: [dmarc-ietf] Draft 10 notes: NXDOMAIN
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My testing was done more than a year ago.   My recollection is that I
discovered it based on something in the wild, and then confirmed it with a
locally-configured experiment.   This time I am having trouble finding
examples.

The only one I can verify is from a previous email exchange on this forum:

mail.foodnetwork.com
returns NXDOMAIN

but
_dmarc.mail.foodnetwork.com
returns DATA for type=TXT

On Mon, Jun 27, 2022 at 9:52 AM Todd Herr <todd.herr@valimail.com> wrote:

> On Sun, Jun 26, 2022 at 1:27 PM Douglas Foster <
> dougfoster.emailstandards@gmail.com> wrote:
>
>> Our draft references and repeats RFC 8020, which asserts that
>>
>> "when a DNS resolver receives a response with a response code of
>> NXDOMAIN, it means that the domain name which is thus denied AND ALL THE
>> NAMES UNDER IT do not exist."
>>
>> My testing indicates that this is not correct.   NXDOMAIN means that no
>> resource records exist for the specified domain name.  The domain may
>> contain subdomain nodes which may contain resource records.
>>
>> My testing performed on Windows.
>>
>> Can someone else test this and report your results?
>>
>>
> It might help further the discussion if you were to favor the rest of us
> with the examples you used.
>
> Specifically, for which domain name did you query and received an NXDOMAIN
> response, and for which subdomain node of that domain did you query and
> receive resource record(s) in return?
> --
>
> *Todd Herr * | Technical Director, Standards and Ecosystem
> *e:* todd.herr@valimail.com
> *m:* 703.220.4153
>
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