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

John Levine <johnl@taugh.com> Mon, 04 April 2022 21:44 UTC

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Date: 4 Apr 2022 17:44:46 -0400
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From: "John Levine" <johnl@taugh.com>
To: dmarc@ietf.org
Cc: sklist@kitterman.com
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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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It appears that Scott Kitterman  <sklist@kitterman.com> said:
>I think the attached addresses this.  I also tried to make it clear that if 
>there's only one domain (common 5322.From, 5321.MailFrom, and d=), then no 
>tree walk is needed.

Is that right? Let's say all three domains are sales.foo.com, there is
no DMARC record _dmarc.sales.foo.com, but there might be one at
_dmarc.foo.com.  I think you need to do the tree walk to find the policy.

This is less urgent, but between steps 7 and 8 8 in 4.6, I'd say that
if you find a record with psd=y or psd=n you stop the tree walk, since
nothing above that is relevant.

R's,
John

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