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DMARC | Glossary | Sitecheck

DMARC (Domain-based Message Authentication, Reporting, and Conformance) is a DNS TXT record that tells receiving mail servers what to do if an email fails SPF or DKIM checks — either pass it, quarantine it to spam, or reject it outright.

Why it matters: DMARC prevents domain spoofing and phishing attacks from your domain, and provides aggregate reports showing who is sending mail on your behalf.

Quick tips:

Start with p=none to receive reports without affecting delivery, then move to p=quarantine and eventually p=reject.
Use the rua tag to receive aggregate reports (e.g. rua=mailto:dmarc@example.com).
DMARC requires both SPF and DKIM to be in place and aligned to be effective.