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Free domain diagnostic

DKIM Checker

Retrieve and validate the DKIM public key published for a domain and selector.

A selector identifies the public key used by your email provider. Your provider usually supplies it during setup.

What this checker tests

  • DKIM1 TXT record
  • Public-key presence and type
  • Common tags and flags
  • Approximate key size when derivable

How to understand the result

DKIM signs outgoing messages; DNS publishes the public key receivers use to verify them.

Selectors are provider-specific and cannot be reliably guessed in every case.

V1 checks the selector you provide rather than pretending to discover it automatically.

Common problems

  • Wrong selector
  • Missing or empty public key
  • Malformed tags
  • Very short legacy keys