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 biyou-kenko.com
Found
Selector: google
(TXT on google._domainkey.biyou-kenko.com)
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA6dFgDjEPl5cJVtbBw3xOyBQeMqOy2K1z4K85UjE6q+5m32olAlKoQW0p8K7s1ix4rLFaUq+nGvzCB95r+nkGOZY3Ss/6KTDi6vEPFrOVNFoQPBXhB0bzMf+wBJ5ApH9bsY0cPZI22pWqojSbfR9TSE/DI+UKI+c7d1+gn27pJrUiHqZMeeuRo8JQ+f5GtFXNASYVGnlBLjsj/WMIJkTzjrKzYj/Q2G4iEaMKVbw4LCrTUsvPgj0m3HhH/ipLnWIQH3bHSh01/b0EfzpsNiG1lDo5FGWN4l/LvV1qD/omLgWmTB/uYVdsUzMWJGbrvv2ZoYjP7YZU2QTm8RfThaXnNQIDAQAB
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.