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.
Next steps: After you set up DKIM for Microsoft 365.Set up DKIM so that a third-party service can send, or spoof, email on behalf of your custom domain.Default behavior for DKIM and Microsoft 365.Disabling the DKIM signing policy for a custom domain.Steps to configure DKIM for more than one custom domain.
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Steps to manually upgrade your 1024-bit keys to 2048-bit DKIM encryption keys.Steps to Create, enable and disable DKIM from Microsoft 365 Defender portal.How DKIM works better than SPF alone to prevent malicious spoofing.This article lists the steps to use DomainKeys Identified Mail (DKIM) with Microsoft 365 to ensure that destination email systems trust messages sent outbound from your custom domain.