Question 3: the absence of a SPF resource record in DNS for a domain, would it
mean SPF-mechanism-authentication fail in DMARC for all email sent from that
domain?
3. Yes...if your envelope-from domain has no SPF record, that is
considered an SPF-fail for DMARC purposes.
But if the HELO Identity has a valid SPF record...? Isn't that supposed
to be checked before the MAIL FROM Identity?
I'm trying to push for clarity on this one issue because it doesn't seem
to be implemented consistently, and with DMARC it's starting to really
matter.
<csg>
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