Free DKIM Record Validator & Key Checker
DKIM signs your messages so a receiver can prove they were not altered and came from someone holding your private key. The public key lives in DNS at a selector you choose. Most providers now hand you a CNAME so they can rotate keys without asking you to touch DNS again.
Worked example — sada._domainkey.example.com
Sample demonstration- PassSelector resolves
CNAME → sada.dkim.sadasend.net - PassKey type
rsa - PassKey length
2048 bitsComfortably above the 1024-bit floor.
- PassProxy status
DNS onlyProxying a DKIM record breaks the lookup entirely.
Valid 2048-bit key, resolving cleanly through a CNAME.
SadaSend runs these checks continuously on your sending domains, and refuses to send until they pass — so mail Gmail would reject never leaves.
Start freePredefined Real-World Test Scenarios
Live verification vectorsInspects Google’s active 2048-bit RSA public key record published in DNS.
Validates cryptographic signature key published in DNS for outbound mail.
Validates CNAME delegation to sada.dkim.sadasend.net for automated key rotation.
What this checks
- The selector resolves and returns a key
- The record parses and the key type is supported
- Key length meets the 1024-bit minimum, 2048 preferred
- The record is not proxied — Cloudflare's orange cloud breaks DKIM
Ready for rock-solid transactional email?
Automated 2048-bit DKIM key rotation, domain-level SPF alignment, and suppression firewalls. Send 6,000 free emails every month with zero credit card required.
Questions
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