How to use DKIM for email in your custom domain | Microsoft Learn
https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/email-authentication-dkim-configure?view=o365-worldwide
webFeb 12, 2024 · DomainKeys Identified Mail (DKIM) is a method of email authentication that helps validate mail sent from your Microsoft 365 organization to prevent spoofed senders that are used in business email compromise (BEC), ransomware, and other phishing attacks. The primary purpose of DKIM is to verify that a message hasn't been altered in transit.
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