A DNS-published email policy that tells receiving servers what to do with messages that fail authentication: monitor them (p=none), send them to spam (p=quarantine), or refuse them (p=reject). Published at `_dmarc.yourdomain.com`. A missing DMARC record means your domain is spoofable and your marketing email is more likely to land in spam. A p=none record only watches; it does not stop anything.
Also known as
v=DMARC1; p=none; p=quarantine; p=reject; DMARC record
How Asteroad uses it. The highest-value finding in the Asteroad Quick Analyzer: it is checkable from outside, common (missing or p=none on a surprising share of commercial domains), and a fast, high-impact fix. The path is p=none to collect reports, then quarantine, then reject once every legitimate sending source is aligned with SPF and DKIM.
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