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 marktplaats.nl
Found
Selector: google
(TXT on google._domainkey.marktplaats.nl)
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAgz0v+l3xiQ/1MkxFD0NCH743SBnpWTnG7KsBSoBmr1qr568mkdoipkEgAL1rw5oaOunnuQQqA5V64cxPM0olj9SeKagdfIk4a3E+Uve4vXGyvrHD53NvuEuSyBwsexKL3BIYTe7R/RlqHVjjsVhj3Gvww66wnr+pxQ723P4jGu2AfDpbOrRotqCIncuTLLTNpAH/RGdtxtbENH07aVoDYxloqtTMe425xrjse1+XBQrzhTiQ4rd90mslVpOm9sGT9EcZT03U/J13qHv67ZbCJWSJOoOups9kDDKLvd5MVx9dzIeGueuUYGrLPv7q1lMbETXyZVAvYWLP2JEWil2/SwIDAQAB
Selector: mail
(TXT on mail._domainkey.marktplaats.nl)
v=DKIM1; k=rsa; t=s; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDImegCFsjC3acFa6y72mSqdxoIPDkPtCQ4HVm5WafeXzARODGsP8jFLbcEfWvhMzf+WgNWv9rzc0vtCD2anI/ZMxhBRJgDGWcM1+/zFfKtr0uWGA8bocwbOpdRUD6jV0+QfF9sA88GcW7NVIIqTLD8ylDoQdUSWF9Jum1xqpsxiQIDAQAB
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.