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DMARC Lookup

Check a DMARC policy.

Look up a domain's DMARC record and see how it handles unauthenticated mail.

What is a DMARC record?

DMARC (Domain-based Message Authentication, Reporting & Conformance) is a DNS TXT record at _dmarc.yourdomain.com that tells receiving servers what to do with mail that fails SPF or DKIM. The policy can be none (monitor only), quarantine (send to spam) or reject (block outright).

Start with p=none and aggregate reports (rua) to see who sends on your behalf, then tighten to quarantine or reject once your legitimate sources pass.

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