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 rbc.ru
Found
Selector: mail
(TXT on mail._domainkey.rbc.ru)
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAnGS9OZ7utCeJ1MLe5baEzL9Y8cNm4SbabK0rU6/ur373eJC02eEgi/qTc2N15bH/mFf5tBbxwA6bLgDFZO71bjpNHB3JzHIgsBzjRir+j64ZSFuuU5Hc6DK7nQN5KE2BVaSmfx3yWQA+AEbKs2qiXwJ5nTVr9PicfNX+ZktSvcF9YCLo+cTM5+p2UeaHKD05nRrpUfpk7Q/FKMgCObj3CJ4bmKSm3/T6MMCejWl+2GpxUe/WRQ8t7lI+LCIn3XR2qcxHzYeMVN85R5pIqpRjDbMGtSxKBhvuOeLI13GIhTsflkQMcA7wsiL3UFO1BMO599h8L0J2yZ+sgVcd5BAHMQIDAQAB
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.