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 concentrade.biz
Found
Selector: selector1
(TXT on selector1._domainkey.concentrade.biz)
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAwFxVziFA14++bhfGjZpAPDIjSe4+yDPBgOw0+L8mjIba9yrNLqzSZeVpYoeC4CaZxQ+CzbhkRffKK495WqmWFjbuzlgmJxZGIfC1ys00AIiycFGETzOt88LK9xOkCI0jqyedTfgimoFi9opi/YT99fTCroAbA3xR52K6Om7l6+CzPXQ/XlaqjztJV3eTCknIW4Zt4IzzbKxDcZNRlzaqO1qnGjzZHVVjxY/OYThC3oFTz8wI3NeJSgHBNrOOzQ0JQXLx/reBF8RbyByj5bXY7hxwlYjdu7/TAk2uGLoruO9glhPsL8HdVkhzeOK430l1lLhhfor5/fAsMVAsBwAVYQIDAQAB;
Selector: selector2
(TXT on selector2._domainkey.concentrade.biz)
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA7POqyUKgOv+MxKTubvk/nH09RqRQOHiPEmzhStUkkdamtiUN+DO+jDM8ldHKKUy09gTISSa4D51vAbLODJ+cdQkV2hIOxzI/m2kfBsGBU+v+tiRZ+3fH0Cq3ll1FftWkgBfEdbRH+frcSqrqRcSgs90OkxFYOrsbJVnGNrEtzY11VxV+ZXI+tOFatwL0kGmifs8NgyZ1dMwIm5BAE33MUJEveTJtZMNWRTX4u3BPYaT6XiBeGwjMkkQZosuJng/RuA48q72Zn1ArH80LPRX+pxYJ75i1WtdyyhduMVIy87fetXAmY3qWYIEvp5w030yTJWfnG1oAHgQK5/NAAOiXYQIDAQAB;
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.