DKIM Analyzer
Free DKIM Analyzer
Discovers DKIM selectors and validates the real public key, algorithm and bit length — parsed with actual cryptography, not guessed from string length.
DKIM Analyzer
Discovers common selectors and validates the real public key, algorithm and length.
Enter a domain above to run a real, live check.
Capabilities
What it checks
32 common selectors
Checks the selectors used by major providers and platforms in parallel.
Real key parsing
Decodes the actual public key to report its true algorithm and bit length.
Weak key detection
Flags RSA keys under 2048 bits and reports revoked selectors.
Why use it
Benefits
- Catch a weak or expired DKIM key before it hurts deliverability.
- Confirm a key rotation actually took effect on every active selector.
- Export the analysis as JSON for a security review.
FAQ
Frequently Asked Questions
A DKIM selector is just a DNS label chosen by whoever configured mail sending — it isn't published or enumerable. This tool checks a broad list of common selectors used by major providers; a custom selector outside that list won't be found without knowing it.