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 worldline.com
Found
Selector: selector1
(TXT on selector1._domainkey.worldline.com)
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAhdP+w5sg1K72/GSmGi3GD3bfjmhwoBuVEGE3FfCUcLfuzkoZe+eZwt0RhpjMjh5yIA+lyVwCgc/XTw+bxLn9naZHTQJpm0514APA1Mq04FgML35jY5+Ei2Aq3C4k+f8SKsYNmaqHHE+dgjqxyVJ9UIgpzFjIt76sLj30CUdL9M1VQs8SfvrJthvGmvpBo1VPn4gVVsIs7DWV1/ypiF4uA6vQR0H5ycAbrOkL0vcygravwPDGpv6o/229nr5G2yVpvAFDcUod5Cgfswa4k6PwzsoWc22JS5iVombaWo1w6rZCKu5UJtMmFzjdvZTfXR/Yh8j++F04SeCYq6A5qxBONQIDAQAB
Selector: mail
(TXT on mail._domainkey.worldline.com)
v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC17tpNLpLlAWVJqQmvHo6+zjNy4fcRWMKU85AkREOPi8g/IynUQWwAL4wNTHLQmD7l8XuADYp+t3yXnhqDlsKDw4Uz5W0ILSTA7jOJb3gI5/56glHJRHIG56wqybUKD7Yv4jJYDKWrRWmdeLylJFMWkrgMDGuWBdnaFh6PjVJA0QIDAQAB
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.