DKIM Record Checker
Enter your domain. We look for a DKIM key under the selectors the big mail providers use.
Free, no sign-up, no email needed for this check.
What DKIM adds
DKIM puts a cryptographic signature on every message you send. The receiving server checks it against a key published in your DNS. It proves the message was not altered on the way and really came from you.
Why this check can say no when the answer is yes
DKIM keys sit under a selector name that each provider picks itself, and there is no way to list them all. We test the common ones. If your provider uses an unusual selector, we will not find it, and that is a limit of the method rather than a verdict on your setup.
Why all three together
SPF, DKIM and DMARC only do their job as a set. Gmail and Yahoo have required all three from bulk senders since 2024, and mail from domains without them increasingly lands in spam.
Common questions
What is a DKIM selector?
A label that points at one specific key, so you can run several keys at once and rotate them. Google uses google, Microsoft uses selector1 and selector2.
Do I set DKIM up myself?
Usually your mail provider generates the key and gives you the DNS record to paste. You rarely create the key by hand.
Does DKIM encrypt my email?
No. It signs the message so tampering is detectable. The content itself is not hidden.