Microsoft 365 automatically sets up DKIM for its initial ‘onmicrosoft.com’ domains. That means you don’t need to do anything to set up DKIM for any initial domain names (for example, litware.onmicrosoft.com). For more information about domains, see Domains FAQ. DKIM is one of the trio of Authentication methods (SPF, DKIM and DMARC) that help prevent attackers Read More