What is a DKIM selector?

A short label that lets one domain have multiple DKIM keys. The selector tells receivers which TXT record to look up: ._domainkey. . Common selectors: google, k1, s1, default, selector1.

How do I find my selector?

Look at the raw headers of an email you sent. In the DKIM-Signature header, find s=SELECTOR. That's it.

DKIM Checker

Validate a DKIM key published under a domain+selector. Checks presence, algorithm, key length.

Check a DKIM selector

DKIM record

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