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 mayfaircardiff.com
Found
Selector: default
(TXT on default._domainkey.mayfaircardiff.com)
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAqHB8osvWerDYQge9RS7khUMwKA7YyBvqsZMfzo4Xap+tE6OHe1/msODBbn4NjSCHMUGI8RVVe3kJEM32O7Z/5qtbMaCWjijud8id/DQ6b0nJPXC6EWO3HztZv7PrGLkV7B10to8k08Q220/LUxAIhBmYMF0iEncPJHryaCMXyHpk9KOfaq6Cu7pyh0k5OHeVAqdQzgQjU/od09cK6jYaKG1rkDrzc09AUkP9tkIQaRW5dyjno1gZqgGSyiaxidliblVfoZ0kCqdPYdg9jM9/YYgNydmzansjRHKFe2Paddgq3+c+G0ZMW9e4u2X++XVJ2rgzXVacXwEIqH7l6SBaswIDAQAB;
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.