In basic, a private key encrypts the header in a domain's outgoing email. Email systems that get email from your domain can use this digital signature to help verify whether incoming email is legitimate. When you configure DKIM, you authorize your domain to associate, or sign, its name to an email message using cryptographic authentication. For more information about domains, see Domains FAQ.ĭKIM is one of the trio of Authentication methods (SPF, DKIM and DMARC) that help prevent attackers from sending messages that look like they come from your domain.ĭKIM lets you add a digital signature to outbound email messages in the message header. That means you don't need to do anything to set up DKIM for any initial domain names (for example, ). Microsoft 365 automatically sets up DKIM for its initial '' domains.
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