Sorry, I should have made it clear that my suggestion was in the context of
the tree-walk proposal. Douglas Foster had pointed out that tree-walking by
itself doesn't eliminate the need for the PSL, because the relaxed
alignment rules still require you to know the organizational domain. I
believe my suggestion solves that problem, without requiring any new DNS
records.

Regards,
Joe H

On Thu, Oct 28, 2021 at 1:11 PM John Levine <[email protected]> wrote:

> It appears that Joe Humphreys  <[email protected]> said:
> >
> >Why not allow the DMARC record to specify what domain root the identifier
> >must align with? Instead of adkim=r meaning "consult the PSL list", use
> >adkim=example.com to mean "use relaxed alignment, and the organizational
> >domain is example.com".
>
> Because first you have to figure out where to look for the DMARC record.
>
> If you have domains aa.bb.cc.de.us, or ee.ff.gg.hi.us, where do you
> look for the org records if the domain itself doesn't have a DMARC
> record? The PSL tells us that they're _dmarc..bb.cc.de.us and
> _dmarc.gg.hi.us.
>
> R's,
> John
>
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