Mail authentication lookup

Check DMARC, SPF, and DKIM for any domain in plain English. Tells you what's published, what it means, and flags common configuration issues.

Use the authoritative option immediately after a DNS change to confirm the new record is actually published, before recursive resolvers have caught up.

If you know your DKIM selector name (often shown in your DNS or mail provider's control panel), enter it here. Custom selectors with opaque names cannot be discovered by probing — DNS protocol limitation that affects every DKIM tool.

Querying DNS…
DMARC —
SPF —
DKIM —