DKIM Record Checker
Enter your domain and DKIM selector to fetch the published public key and check its strength. DKIM cryptographically signs your mail so receivers can verify it wasn't altered.
Want the full picture? Run a complete spam test — it checks DKIM checker plus everything else against your actual email and scores it 0–10.
Frequently asked questions
What is a DKIM selector?
A selector identifies which key to use; the public key lives at
selector._domainkey.yourdomain. Common selectors: default, google, s1, k1, dkim.What key length should DKIM use?
RFC 8301 requires at least 1024-bit and recommends 2048-bit RSA with SHA-256. Keys under 1024-bit are rejected by major providers.
How do I find my selector?
Check a DKIM-Signature header in a sent message for the
s= tag, or your ESP's DNS setup instructions.