On Mon, Apr 5, 2021 at 3:08 PM Todd Herr <todd.herr=
40valimail....@dmarc.ietf.org> wrote:

> I did not require an MX record, per se; the requirement was that there be
> either an MX record or, failing that, an A/AAAA record.
>

Given that this is what RFC 5321 Section 5.1 prescribes in terms of
answering the question "Where should I try to connect to deliver this?",
that seems like a sane thing to use as a test.

-MSK
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