On Fri 17/Dec/2021 21:05:39 +0100 John Levine wrote:
It appears that Alessandro Vesely <[email protected]> said:
Of course, if the From: domain doesn't exist at all, it cannot have a DMARC
record. However, according to the formal definition of Section 3.6.2, a
non-existing domain can pass all DMARC tests. ...
DMARC lets a domain owner say "if mail with my name on it doesn't have
these features, it's not from me." The org domain hack lets it say
similar things about its subdomains which may or may not exist.
Yup... more or less. Time gave a good summary of p <=> sp. np is new and
there's no data but np=reject. Almost boolean. (And I still don't see why a
legit sender would use a non-existing domain in From:.)
But other than that, domains that do not exist do not have DMARC policies,
and DMARC has nothing to say about them. Please stop trying to make it
into a FUSSP.
Nobody is trying to invent a FUSSP here. However, DMARC has to coexist with
different email filters and different aims, so it's useful to give some hint at
how it relates to them. Adopters might stare at Section 3.6.2 trying to grasp
its (lack of) meaning.
There are good reasons that a mail system might refuse mail from domains
that don't have an MX, A, or AAAA, but they have nothing to do with DMARC.
It's easy to build false syllogisms using those terms, though.
Best
Ale
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