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[dmarc-ietf] What happens for org and PSD lookups when you are already above the PSL boundary?

Kurt Andersen <kurta@drkurt.com> Thu, 18 April 2019 19:46 UTC

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From: Kurt Andersen <kurta@drkurt.com>
Date: Thu, 18 Apr 2019 12:45:42 -0700
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To: "dmarc@ietf.org" <dmarc@ietf.org>
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Subject: [dmarc-ietf] What happens for org and PSD lookups when you are already above the PSL boundary?
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If we have a boundary that is 6 names deep in the DNS hierarchy (so the org
domain would be 7 names long), then what is a DMARC validator supposed to
do with an email that claims to come from the domain that is only 5 names
long? What happens to the second lookup (org-level)?

Example:

priv-org.psd-a.b.c.d.e.example: If an email comes from
sub1.priv-org.psd-a.b.c.d.e.examplepriv-org.psd-a.b.c.d.e.example, then
lookup 1 is for _dmarc.sub1..., lookup 2 is _dmarc.priv-org... and the
proposed lookup 3 (for PSD protection) would be _dmarc.psd-a...

If the email comes from b.c.d.e.example, then lookup 1 is _dmarc.b... but
what would lookups 2 and 3 be? skipped?

--Kurt

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