It appears that Scott Kitterman  <[email protected]> said:
>
>
>On June 22, 2022 2:54:28 AM UTC, John Levine <[email protected]> wrote:
>>It appears that Scott Kitterman  <[email protected]> said:
>>>Not confusing is indeed the tricky part.  I think what's wanted is shortest 
>>>that's longer than the longest PSD.
>>
>>How about this?
>>
>>b.a psd=y
>>c.b.a NXDOMAIN
>>d.c.b.a blah
>>
>>What's the org domain for e.d.c.b.a?  I think it's c.b.a.   Is the policy 
>>domain is d.c.b.a or b.a ?
>
>I think that because of the b.a record with the pad= tag that's correct for 
>the org domain, although I'm not sure why anyone
>would do that.  Without the PSD record it would be d.c.b.a.

Imagine that b.a is something like co.uk, abd d.c.b.a is mail.crumpets.co.uk.  
I don't think that's a great DMARC setup
but it doesn't seem ridiculous.

>For policy, it should be b.a, but I'm working from my phone right now and I'm 
>too lazy to look up what the draft actually says
>(vice what I think it says).

I think we agree about what we want it to say, you stop the tree walk when you 
see psd=y/n, the policy domain is
the last record you found,  org domain is the last record unless it's psd=y in 
which case it's the level below.

I'll do a pull request so we can see if we agree on language.

R's,
John

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