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 smarkets.com
Found
Selector: google
(TXT on google._domainkey.smarkets.com)
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAo1Oufphe9QkJFTMAM1PGD8U31Vn4IsVHp9T/7E/n1qvD2nwN2Eo7R3H95YOZaFfIqxd1awDTzYQNcBn8lKupIbgWAIuFtNbGa99k/f6L8JrB85fs8dlIJksWXw0GpbWtI/I+rLRRD+A+zB9wgDfPzYIAcRdCwbFY3GnATOyOc1lEE69p35u28uQQGDqBO9D4GFSrEn8GW70NOWtmnp+WQ+87e4jRfkWUe5V9j/ey/klIySr3aDhUipWjbRFQew4KqYOJ2VBZTE6VxisDV55TlFpm48qVQWTQTdoyMLIcLBhk3IL2Rp5z5V8Px682GMruJKjvafT83lbcOpcfAy0CmwIDAQAB
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.