DMARC (Domain-based Message Authentication, Reporting, and Conformance) is a TXT record at _dmarc.<domain> that tells receivers what to do when SPF or DKIM checks fail and where to send aggregate reports.

DMARC Policy Check for this-domain-should-not-exist-983746273.com

No DMARC record found

No DMARC record at this domain

Mail from this domain is not DMARC-protected. Receivers have no policy instruction for handling SPF/DKIM failures.

The policy values p=none / p=quarantine / p=reject move from observation to enforcement. p=none reports issues without acting; p=quarantine routes failing mail to spam; p=reject blocks it outright. The pct= modifier scales enforcement (start at low pct=, ramp up).

Start with p=none + a working rua= reporting address to gather data without disrupting mail flow. Once reports show clean SPF + DKIM alignment for legitimate senders, ramp pct from 25 to 100 under p=quarantine, then promote to p=reject. Without a reporting address, DMARC enforcement is blind.