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 nidomcc.com
Found
Selector: default
(TXT on default._domainkey.nidomcc.com)
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAze7sQBlDIxuAd1qqSdq43B7FgRs6ko2HNY3jbK2ASJ2VxXPBATQLNXUiKbfspoZehC3/O4j/eyfs8tk7aWSQRWJJclGa5D1lI0fFj8mGIie0fjMcFisUUCygkSVT1DSW30X9vE61GW/PG68GMsNCRlqyX8aRBUrdfE3HT2nUEQMjuQgjMeNZFNpYcJuDv/Mln1Orti0+9Z+VBwPjVXiXbNBt+U5mjygBAraXi2bziHJgzshw8iiL9l6GeFFEHtWF7vePVpTzc+v2nztpYQVYmwI8Z8TQja2y6eGpeiyfxcG4j7CAyIqPzk6rYcbSpBfxgI4YluYgLRfL1BqGxrnrxwIDAQAB;
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.