Free tool
Free DKIM record checker
Verify the DKIM public key published on a selector and confirm your signing is set up correctly.
Why it matters
What this record proves
DKIM proves a message was not altered in transit by signing it with a private key that pairs with the public key in your DNS.
- Find the selector your provider uses, then query selector._domainkey.yourdomain.
- Confirm the key length is 2048 bits where your provider supports it.
- Check the key resolves for every domain you send from, not just the primary.
- Re-check after any provider migration — selectors change.
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