DKIM Checker
Detect whether a domain publishes DKIM keys on common selectors.
About this check
DKIM (DomainKeys Identified Mail) attaches a cryptographic signature to outgoing email, letting receivers verify the message was not altered and really came from the domain. The public key lives in a DNS TXT record at "selector._domainkey.yourdomain".
Because selectors are chosen by each sender, a checker can only probe common ones (default, google, selector1/2, k1…). A negative result means no key was found on those selectors — not necessarily that DKIM is absent.
Frequently asked questions
Why might DKIM show as missing?
Your provider may use a custom selector this tool does not probe. Check your mail provider's DKIM settings for the exact selector.
Does DKIM stop spoofing?
DKIM proves integrity and origin; combined with DMARC it lets receivers reject unaligned mail.
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