Free DKIM Record Checker
Look up DKIM records for all common selectors on your domain. Verify key length, algorithm, and detect weak or missing DKIM signatures.
Frequently Asked Questions
What is DKIM?
DKIM (DomainKeys Identified Mail) adds a cryptographic signature to outgoing emails. Receiving servers verify the signature against the public key published in your DNS, proving the email was not altered in transit.
What is a DKIM selector?
A selector is a label that points to a specific DKIM public key in DNS. You can have multiple selectors (e.g., for different email providers). The sending server includes the selector name in the DKIM-Signature header.
What key length should my DKIM key be?
Use RSA-2048 or stronger. RSA-1024 keys are considered weak and many providers now reject or warn about them. Ed25519 keys offer equivalent security with shorter key material.
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