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Email domain health checker

Inspect mail routing, SPF dependencies and lookup budget, explicit DKIM selectors, current DMARC policy discovery, MTA-STS policy coverage for published MX hosts, and TLS reporting in one report.

DNS queries use the isolated validating resolver. If MTA-STS is advertised, the checker fetches only the standard HTTPS policy file. It never connects to SMTP or report destinations. DKIM selectors cannot be discovered reliably. Enter the selectors published by your mail providers; comma- or space-separated values are accepted.

Submitted domains, selectors, DNS answers, and policy files are not stored as application data. Usage limits apply.