DKIM Record Checker
DKIM signs outgoing emails. Receivers verify the signature using a public key in DNS.
DKIM lives on <selector>._domainkey.<domain>. If selector is empty, we try common ones.
Result for thefreedictionary.com
Found
Selector: selector1
(TXT on selector1._domainkey.thefreedictionary.com)
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA31R69qVLizmHKvGAyI/U5jftYyDBGaxmCsCAwX3+/ockliQ+sdx1RFNFXjoOG5PcAzJYc2C/nQ2k3UlZ+YLFO+15roG8wqsZtTj0tAbAspw8jZgOD2bjI00Yen7/LXgDISRyuGLrCnXr7rahS/NjQBa3Cf38ZKIWcS43xq+WeCTRAyxME4ywi+23ZKIkkYo5Q46vgpovmLz62A7oDOfjhxNz9xRFCwtUYeP1QVNJhuOuwT+PKuf+1JzuQmrZtfmx7mqWh7caI61vycjKfymA+58mUTCM62BZ2WIKcrhpZQfFzIqz2SjBdemrQrwL1uRzECa5oH6rUoIfnaYWctGkeQIDAQAB;
Selector: google
(TXT on google._domainkey.thefreedictionary.com)
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAln2LrUiR7IK1ROUh3jr0nUeLI9F+K3Fk+Gwvk+i43Juz4gZMAtEJms/BshU7Pv37G8fZNg8IP4eTxGTBpAwYIyLAYXeUWQMoMDdZKPIW11Z1Pf6ExQ2FnhGDJfyYeqVxY6+0cW1ZYfRxXro9NO8AnVq+awdB741RjXbAzNMLp6H6aYe+W4vVZjKjEY4tYiTpd2OAbLmpy2X4aH1cpGr3raoU35fi4I0GmRWK9GaPd9tpKYcDb6TnvyyEyhncmcdfu6YCSHxQsaEdfVHIIv+oH2C+ecCwGmjpEiW2gMVsKJ7r3/vktqibPhuHgAWQF6ZBMlOdVhn1lEkFba3oRXsOXwIDAQAB
FAQ
Why does DKIM require a selector?
Selectors allow rotating keys and running multiple keys per domain.
Where is DKIM published?
TXT on <selector>._domainkey.<domain>.
DKIM record exists but emails still fail DKIM?
Signing may be disabled or the selector used in email differs from DNS.
Do I need DKIM if I have SPF?
Yes, many providers use both for best deliverability and DMARC alignment.
Can I have multiple DKIM selectors?
Yes, that is common for key rotation or multiple senders.
What is DKIM?
DKIM (DomainKeys Identified Mail) adds a cryptographic signature to outgoing emails. DNS stores a public key that allows receivers to verify authenticity.
Example
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0B...
Common mistakes
- Wrong selector (the record exists but under a different selector).
- Key is split incorrectly across multiple TXT chunks (some DNS UIs break it).
- Publishing DKIM but not enabling signing on the mail provider.