Email authentication checker (SPF, DMARC, DKIM)

Check a domain's SPF and DMARC records and the two default Microsoft 365 DKIM selectors with a live DNS lookup. Free, no sign-up, nothing stored.

This performs a live public DNS lookup for the domain you enter — it doesn’t contact the domain’s mail server or send any email. See the DMARC rollout guide for how to act on the result.