DMARC, SPF, and DKIM Email Security DNS Record Validator
Validates domain email authentication DNS record syntaxes for SPF, DKIM, and DMARC enforcement policies.
Notice: engineering verification utility. Use test or de-identified data and verify results independently before relying on them.
How it works
Standard: RFC 7208 (SPF), RFC 6376 (DKIM), RFC 7489 (DMARC)
Formula: Parse policy tags (v=spf1, p=reject/quarantine, k=rsa)
Checks: Valid DNS TXT record prefix and policy tags
Calculated locally in browser memory; nothing leaves your browser.
Deterministic local-first client-side execution. Provided as-is without warranty.