Re: [dmarc-ietf] Nonexistent Domain Policy was: Re: Working Group Last Call: draft-ietf-dmarc-psd

Seth Blank <seth@sethblank.com> Fri, 12 July 2019 18:16 UTC

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From: Seth Blank <seth@sethblank.com>
Date: Fri, 12 Jul 2019 11:15:51 -0700
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To: "Kurt Andersen (b)" <kboth@drkurt.com>
Cc: Scott Kitterman <sklist@kitterman.com>, "dmarc@ietf.org" <dmarc@ietf.org>
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Subject: Re: [dmarc-ietf] Nonexistent Domain Policy was: Re: Working Group Last Call: draft-ietf-dmarc-psd
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On Fri, Jul 12, 2019 at 10:55 AM Kurt Andersen (b) <kboth@drkurt.com>; wrote:

> I am much more concerned with adding another tag that can only be used in
> a PSD-DMARC record. I would be much more open to make a "normative" change
> to the DMARC tag list (RFC 7489 section 11.4) to define np for any DMARC
> record, than to make this a special case for PSD-DMARC records.
>

I am also concerned with adding any new policy-related tags, due to the
confusion they create that limits adoption. However, a very clear case for
an NXDOMAIN policy has been made by UK NCSC for .gov.uk, and both .gov and
.mil have stated they also want this behavior. Others have shared similar
opinions privately.

Since PSD is an experiment, I think this is a fine place to test an np=
tag. If it gets usage, then we have a clear argument for it being a normal
tag for DMARCbis. If not, then it can be jettisoned altogether.

Adding this tag for PSD will simply need explanatory text in the
Experimental Considerations outlining this.

Seth