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 instructables.com
Found
Selector: selector1
(TXT on selector1._domainkey.instructables.com)
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA5JJjJHrlXo75hvHqI1ITBLJPilX76zUsfkCE6Zrnam8ESTJPRGqlxlrFfyT4NqrAJ/TVHpdiYWn6/lTkrXQmzEpGyYjmAdzTUwLP2weUrBjDeU4DhlmoDOVb8KbPTIK0G59iFQKrswdQfwmeEr8jMSlakUaIi452w2Cqdnxel+FKbgQpyYoPM4vZkddQ6WwUPFwOVJop/1MH/HsdFXI/Xg7qiKrrGC5rak7g8jApWN2hxd8LY8CDCvmYpktZEenyg/hMTFAQfyc64BwsU91fYD3euFpO/I20164CVLTOCagsnzw0aQ+KpfGQ2s53gavKNMJkShg2BBGE7wNyaqYXoQIDAQAB;
Selector: google
(TXT on google._domainkey.instructables.com)
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA6PFecBc5vpKKPZKvoUe0IqsYuHmeUxYPiQW7DnAfnY1klCGKPGCu2vkdeNcETV38YVnkQisv//09xVw25JqxhVW+V4lRfedk2oxj9vVk7hOUSWEWdxd82L6AGtO3TkIfn5tpDKX4Me1WK+U0djp8G7tqyIJC6uwo2sMBaAQ71k0Fv994oMMV3GkbH1MhpTsl3g4JOdAz1NC4SniCKdEu9jXCmIZyCHdlGKEwHv0wcwSx2NX7/ttIc7PVq3IGXvqK5JCPYpbUsOcHKRki1oXNTw08DqG925+fWjOQGf0joZC4uiQRexycrhbDeL6/ifZtbGeLqAXwSBfd7zh18CCxswIDAQAB
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.