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 merchantcreditcorp.co
Found
Selector: default
(TXT on default._domainkey.merchantcreditcorp.co)
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAp2RtmbZPDB4gTLRW1N904XiV1dCCaBbEEsetExnD62/Ig78zEaVXZJ56OAoQt8s8nU0gg2wdW9wCPdCRaAe6lY73/tVykqb5Uof3uj0M5MHTgvpn6B88xoV7I3H5dLS4tKLhwVfPg0Iubhtgau8IVjshxB4tJK3hF1KX9dcp5a9olRQx9frCORZlxq5OedGpCnE0e821Z60Iq5suMB/z/gBSvZw/P2onLMGLIGWCVCcRuNYatAnmMUeDhH9QEzgpz7RwmVXMe32biy8zChRoOW5tMy+9b4lA6iYy2AoJJh0HP7xdSa5Lkbn1njkfhf163KdrbXRUeQO0AWf1G+sQ6wIDAQAB;
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.