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 marriott.com
Found
Selector: selector1
(TXT on selector1._domainkey.marriott.com)
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAx/oAbxUkhVbeHDt4dA9psiSYP916km3jR/z2O8SdO/gu0Pf6Vk26NUt9Qiif0U32JkDQTZoXCVQJAi3fk7+41RncNFyAIkwsTMNvmmkg350VNgC0FGu4WwWmMJ44WMhZvLtZnxz6RNhlJDq88jNBd67+mli/aBnQaV7ijljxfcnXQvpoUDSgC1EGCs//1XbHvYzUlmKs9LxpYxz7kL2iTva8WUZJ0N0MUBOJB2Ox3OyPs832RMQs+Ox8jcqtOr1TQVJNPXEKYuZhDiPXHOtri+TGzVx0XYC7/V8jGrLyeafdoHppB/QJ1LgorWXQsgPOz5qiuBUIK/+YkUk0HVkahQIDAQAB;
Selector: selector2
(TXT on selector2._domainkey.marriott.com)
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtEmJ8fIEbl1EpVi7gIdCsT2zUfmaeqY/JbaD0Tn55kY8s/92XNPexVXWnKG9WNIBh9/crPYTDBnEwNk1Ykml1lbF246mX9g/Sb8u53ZCh+639kHfPUXG12LfUJ8wFnAT745R8oCiONCAmMy0lo4lilGHZ2CM9DhwmsYTYNBs9Hiue3Of1MTV+S+UeIlWfZSnHOLSEge7LkJh+XdPq4ruFCChTTx4ptpWFqsRJa3TZM2HuOa36hz3teuf2OqzWTwGG0YcmlZiRfLcDA6iQKBC5uUFo7wnjr7NFGc7Lni5FonPRKeu17o1NmVP4l5RW3OaZfJABr95PMYU1yeM2lpsqQIDAQAB;
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.