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Re: [dmarc-ietf] PSD Related Privacy Considerations For Aggregate Reporting Draft

Emil Gustafsson <emgu@google.com> Tue, 31 January 2023 20:48 UTC

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From: Emil Gustafsson <emgu@google.com>
Date: Tue, 31 Jan 2023 13:47:42 -0700
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To: Todd Herr <todd.herr=40valimail.com@dmarc.ietf.org>, John R Levine <johnl@taugh.com>
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Subject: Re: [dmarc-ietf] PSD Related Privacy Considerations For Aggregate Reporting Draft
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Todd; Thx, not sure how I failed to find that. ¯\_(ツ)_/¯

John; For the reporting purposes (
https://github.com/ietf-wg-dmarc/draft-ietf-dmarc-aggregate-reporting/pull/15/commits/0d1ea6e71e0697dde3f6effbd5c7d6d5a8ff0360)
I don't think we care about that _dmarc.example.com does not exist in the
example, but what matters is really the existence of example.com as I think
the purpose is to not leak information to a PSO for a domain that do exist
without a DMARC record. Because if the domain have a DMARC record, the PSO
DMARC record would not be relevant anyway.

Anyway, I think the NXDOMAIN response combined with the authority section
actually eliminates the 6th DNS lookup. I suppose it actually eliminates
lookup 2-4 too for non-existing domains, no?

/E

On Tue, Jan 31, 2023 at 12:57 PM Todd Herr <todd.herr=
40valimail.com@dmarc.ietf.org> wrote:

> On Tue, Jan 31, 2023 at 2:30 PM John Levine <johnl@taugh.com> wrote:
>
>>
>> I suppose we could say that a domain doesn't exist means you do a DNS
>> lookup and see if the result is NXDOMAIN but that seems obvious.
>>
>
> We already do say that -
> https://www.ietf.org/archive/id/draft-ietf-dmarc-dmarcbis-25.html#name-non-existent-domains
>
>
> --
>
> *Todd Herr * | Technical Director, Standards and Ecosystem
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