1. Create the first required “CNAME” records at your registrar or DNS provider
    • Type: CNAME
    • Name: selector1._domainkey
    • Content: selector1-domain-com._domainkey.domain.onmicrosoft.com
      • domain-com should match your real domain name
      • domain.onmicrosoft.com the “domain” part should match your onmicrosoft url
  2. Create the second required “CNAME” records at your registrar or DNS provider
    • Type: CNAME
    • Name: selector2._domainkey
    • Content: selector2-domain-com._domainkey.domain.onmicrosoft.com
      • domain-com should match your real domain name
      • domain.onmicrosoft.com the “domain” part should match your onmicrosoft url
  3. Next, visit Microsoft DKIM Configuration, click the domain you wish to configure DKIM for, then toggle DKIM Signatures to Enabled

You can verify that your domain is properly configured by visiting the Microsoft DKIM Test page.