Free DKIM Record Checker
Lookup and validate your DKIM configuration. Check key length and verify email signatures.
We automatically check common DKIM selectors (google, default, selector1, selector2, etc.)
What is DKIM?
DKIM (DomainKeys Identified Mail) is an email authentication method that adds a digital signature to outgoing emails. This cryptographic signature verifies that the email was sent from an authorized server and hasn't been modified in transit.
When you send an email, your mail server signs it using a private key. The receiving server then looks up your public key (stored in DNS) to verify the signature.
DKIM Record Example
selector._domainkey.example.com TXT "v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBA..."Key Components
- Selector — Identifies which key to use (e.g., "google", "default")
- v=DKIM1 — Version identifier
- k=rsa — Key type (RSA is most common)
- p= — The public key (base64 encoded)
Recommended Key Length
- 2048 bits — Recommended, provides strong security
- 1024 bits — Minimum acceptable, consider upgrading
- 512 bits — Obsolete, should be upgraded immediately