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 hulu.com
Found
Selector: default
(TXT on default._domainkey.hulu.com)
v=DKIM1; g=*; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCmTUqV5La8ciVosYQx88x77+zyMf4FN8gJM5NDYns+5ErkcB0FWZZaId7r2DHnBhL+9HU4hQ29rgFmhoN4D5zPb2wz+vIHGCQJqCu7mJM1E2M6HB14iSbOGIH4XW8puJJgpqNOsTOkMJpktoZxTFIGGnWyCfTJ7Uryys6G31It6wIDAQAB
Selector: selector1
(TXT on selector1._domainkey.hulu.com)
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAvNUNw5UNur/r3ldr3O33K2RBd8BA5gJZmuQg+y+5drNPPXaUbLtbwBd9sf1nNkTo1Kb5xTUSaOo7wlK/l3tQLg6dEfJ2xIdbrnhv1A4L9MVID6OP/DSCNbJwXNu1byoDeerN8L2nSGARk6jlDLC+rt9QXkmGjAsia22eM8o8Qqj8tO+TCOtEio246OyqP3XLoO+SNTisD14Yqt5xYQsUk/F+yQkwJaVUD75Tuj7bayJjEt/tHwV+u5V8oL+Si69Ia418hlrfc5x3pQv3FK2KD7/dZiHxcO9pIzTKLDoeRbwh56r61DLIkLuDpcPDNUZ7pX5UlZv/hPOelAEpTMjDUQIDAQAB;
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.