DKIM (DomainKeys Identified Mail) adds a cryptographic signature to every message you send, so receiving servers can prove the mail really came from your domain and was not modified in transit. Enter your domain and we will look up the DKIM public key. If you do not know your selector, leave the field empty and the tool probes the selectors used by Google Workspace, Microsoft 365, Zoho, SendGrid, Postmark, Mailjet and others.
A DKIM key of 2048 bits or more is recommended. Together with SPF and DMARC it forms the three-part foundation of modern e-mail authentication.
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