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 bsumc.info
Found
Selector: default
(TXT on default._domainkey.bsumc.info)
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEArScOpROlge8gTMhzUxI9yYB23hIwZRSgv7uNGMSzZjsydYtZW9KwQ92O5QO0+DAw1N2lTKOwd8TLwCZcWM/PizbkrJI/jndtaAlQqNNJIG3xYM4P+DGGhi+/AUrlAGgGGBfWEkJJ7gwv6qIH+RL8kRgllv8k1UlWKhW8XBuI0yk3I6BKDA8Fu8T46gP+5DD+CMhb1O1mlSH5sswvGwzheVwXdXXfnJslohqDFIKEvPRcNo10oXziFQFltumZ8tVbwSc12vrInnQNvthDXYbRitMfw85qSxr08vNGS1HQ7fdbaQ1s6+kh0sp2oQAVjPxRLMnWrRQsoWpA8WgqCY3XQwIDAQAB;
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.