DMARC Checker

Fetch and parse DMARC records. Every tag explained, policy scored, and actionable findings surfaced.

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Findings

// how dmarc works

DMARC (Domain-based Message Authentication, Reporting & Conformance) builds on SPF and DKIM. It tells receiving mail servers what to do when an email fails SPF or DKIM authentication — none (monitor only), quarantine (send to spam), or reject (block entirely).

The rua tag specifies where to send aggregate reports (XML summaries of authentication results). The pct tag controls what percentage of failing mail the policy applies to — use this to roll out gradually.

The path to full protection: none → quarantine at pct=10 → quarantine at pct=100 → reject. Never jump straight to reject.