SecuryBlackDKIM Selector Checker
Most people don't know their DKIM selector — we automatically try the most common ones, and you can add your own if you know it.
What is a DKIM selector and how do you find it?
DKIM verifies email integrity using public-key cryptography. The sender signs outgoing emails with a private key, and recipients verify it against the public key published in DNS.
Selectors allow a single domain to support multiple email providers simultaneously (e.g. google._domainkey for Google Workspace and s1._domainkey for transactional mail).
DKIM Selector FAQs
Where can I find my DKIM selector?
Check the DKIM-Signature header in any sent email (the s= parameter) or your email delivery provider dashboard.
Why is my DKIM record failing verification?
Common causes include typos in the DNS TXT record, outdated RSA key sizes (<1024 bits), or ongoing DNS propagation.
And the rest of your email?
DKIM is just one piece. SPF, DMARC, headers: check it all free in a minute.