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PUBLIC WEB DIAGNOSTIC
DKIM Checker
Inspect a public DKIM key for a mail selector.
Methodology
Look up selector._domainkey.domain as TXT after validating both labels. Only the public key record is displayed.
What the result means
A selector TXT record and key status. Treat it as a practical observation rather than a guarantee about every user or provider.
Limitations
A visible key does not prove a message was signed. Unavailable results are reported honestly instead of guessed.
Worked example
For selector s1 on example.com, inspect s1._domainkey.example.com. A p= value indicates a published public key.
FAQ
What is a selector?
It names the DNS record containing a public key.