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Re: [dmarc-ietf] 5.5.4. Publish a DMARC Policy for the Author Domain - dmarcbis-06

John R Levine <johnl@taugh.com> Sun, 03 April 2022 16:07 UTC

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Date: 3 Apr 2022 12:07:29 -0400
Message-ID: <83bed554-8def-0952-28e8-47cf6abe67df@taugh.com>
From: "John R Levine" <johnl@taugh.com>
To: "Alessandro Vesely" <vesely@tana.it>, dmarc@ietf.org
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Subject: Re: [dmarc-ietf] 5.5.4. Publish a DMARC Policy for the Author Domain - dmarcbis-06
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On Sun, 3 Apr 2022, Alessandro Vesely wrote:
>> It still gets the wrong answer for psd=n above psd=y.
>
> Why?

See the example I posted last week.

>> (If the one beneath it has no DMARC record, is it still the org domain? I think it is.)
>
> This seems to be inconsistent with the sentence that follows.  Would the 
> landscape change if .com suddenly publishes psd=y?

Currently with the PSL lookup, foo.com is an org domain whether or not it 
publishes a DMARC record, and mail.foo.com and sales.foo.com are in 
relaxed alignment.  While I think it would be reasonable to say that an 
org domain has to publish a DMARC record if it's going to be used for 
relaxed alignment, that would be a change from the current rule.

Since there is no chance that .com .net .org or other large TLDs will ever 
publish a PSD record it makes little difference in practice, but if we 
agree the org domain needs a DMARC record, we should make clear that this 
is a deliberate change.  It's a good idea since if foo.com has no DMARC 
record and .com has no PSD record, it won't work as an org domain anyway.

Regards,
John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly

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