Find and validate DKIM signing keys for a domain by selector, or scan the common selectors. Free DKIM checker from Total Group.
DKIM adds a digital signature to outgoing email using a private key, with the matching public key published in DNS. Receiving servers check the signature to confirm the message really came from your domain and was not altered.
A selector is the name that tells receivers where to find your DKIM key in DNS, for example selector1._domainkey.yourdomain.co.uk. Microsoft 365 uses selector1 and selector2; Google Workspace uses google.
