Free tool
DKIM record checker
Enter a domain and a DKIM selector to see whether its signing key is published. Not sure of your selector? A full check discovers them for you.
What this tells you
DKIM keys live at selector._domainkey.yourdomain.com, where the selector is chosen by each sending service (Google uses google, Microsoft uses selector1/selector2, and so on). This tool checks one selector. DMARCER’s DKIM management discovers every selector you use automatically and watches each for weak keys and stale rotation.
What is DKIM? →
The basics, in plain English.
DKIM management →
Automatic selector discovery & health.
All free tools →
DMARC, SPF, MTA-STS and more.