DKIM Checker
Find a domain's DKIM records across the common selectors, in one lookup.
DKIM adds a cryptographic signature to mail; receivers verify it using a public key published in DNS under a selector. No signup required.
How to use the DKIM Checker
- Enter the domain you want to check (for example, example.com).
- We probe the domain's DNS across common DKIM selectors.
- Review which selectors publish a DKIM public key.
Frequently asked questions
DKIM publishes a public key in DNS under a selector (selector._domainkey.yourdomain). It lets receivers verify that a message was signed by the domain and was not altered in transit.
A selector is a label that points to one DKIM key, so a domain can run several keys at once. Providers pick their own selectors, which is why we probe the common ones.
If no record shows up, the domain may sign with a custom selector we did not probe, or it may not have DKIM configured. Check the selector your email provider uses.
Monitor this automatically
DeliverSignal runs these checks daily and alerts you when something breaks.
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