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 mynavi.jp
Found
Selector: default
(TXT on default._domainkey.mynavi.jp)
v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDK3whipkQAGHdFrIWf5EAav/tCQL7CdbP1BaiY7rPSItprjAviF/vnNXffJb1VWlJsNyZoUdMaU+4LfXEKFAcF8fGdeHN1tolRrBuS8mP/6/c8twY2kw40i300SyZIK2WJtRH7K38OBLvq9+BXkY3dlp16XRyrQg4gtIRhosXdnwIDAQAB
Selector: selector1
(TXT on selector1._domainkey.mynavi.jp)
v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCUmVdo/QyDUwLPkd+TPuoVRd8qbrRL4mijwoYwmJ6VBbEPaMkizlOsBKuhamGtNLRomHsAv+Fwa52dWwxKrBXA7VvK536hKa19+uAZc7T1HoszUtkSH3Avw7aXWphifKUfLoABxleEuphuVxDcBXbd8NS+ZYBn48tPXuQ7TGOFYwIDAQAB; n=1024,1477735407,1493460207
Selector: selector2
(TXT on selector2._domainkey.mynavi.jp)
v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDOzEqQ8wk5WsuANUB7cLs1czBDtGtzhLPb5760yJ9x0+dvvd7KLs+5ywDXTmwfxv8j4QOQ8iIa4+cKldE8HiZFD7Uq97dXPOA6UJLBq7aBN/BNVhlwkdwqozpn/u2Hh0/UyfgLRDLMuKatW3f+I09cAT/ax7btCdTqWsyDyV7ZjQIDAQAB; n=1024,1477735407,1
Selector: google
(TXT on google._domainkey.mynavi.jp)
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEArk3W2vYmbiWGqS6VURaxQ8z6La8s2+uLbKAeynchiIBrDQM57WK1SDsYFL3/T4AvGDil0wh69meH/podL3u09H0NqjIndQBfzvPBcbJq4jlvdQvN5s/+2PP5nAXxCsROUHS6NCx1JAGwCc9YC6qQt0H6OjcBniDdvlOQKqNTIl2pnKGSgWWMZijwLA8pCNv1y8A8qa+9B9QogguRTDJ4R/B1rO6ZjkH/0wXFUl3nfyi/Ga/5mpGNSI0RswhFFVDYGLC7oCZRUr6XPgkyOUzdWLKqk3GnQIdCTez+nOOAm+fFCudH2+r306xrxJ9Y5dfAtorctkG5EyBh6mN7II//yQIDAQAB
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.