Enabling DKIM (DomainKeys Identified Mail)

Publish two CNAME records for your domain in DNS

You’ll have to know a couple of things from your e-mail services at Office 365: Your domain GUID and your initial domain. Don’t worry, we’ll guide you through it:
  1. Get your domain GUID
    Your domain GUID is based on your domain name, replacing the dots with dashes. So let’s say your domain is contoso.com, then your domain GUID would be “contoso-com”



    Take note of your domain GUID because you’ll need it latter.

  2. Get your initial domain
    Initial domain is basically your tenant name in Office 365. You can get it from Admin Center – Domains. It is that domain ending with “.onmicrosoft.com”. For our Contoso company it could be “contoso.onmicrosoft.com”.



    Take note of your initial domain too.

  3. Create two CNAME records in you external DNS zone
    Host name selector1._domainkey.<domain>


    where <domain> is your domain name

    Points to selector1-<domainGUID>._domainkey.<initialDomain>


    where <domainGUID> is your domain GUID and <initialDomain> is your initial domain.


     Host name selector2._domainkey.<domain>


    where <domain> is your domain name

    Points to selector2-<domainGUID>._domainkey.<initialDomain>


    where <domainGUID> is your domain GUID and <initialDomain> is your initial domain.



    For Contoso.com, those would be the required records:


     Host name: selector1._domainkey.contoso.com
     Points to: selector1-contoso-com._domainkey.contoso.onmicrosoft.com
     Host name: selector2._domainkey.contoso.com
     Points to: selector2-contoso-com._domainkey.contoso.onmicrosoft.com



Enable DKIM signing for your domain in Office 365

  1. Sign-in at Exchange Admin Center with an administrative credential
  2. Go to Protection > dkim
  3. Select the domain for which you want to enable DKIM and then, for Sign messages for this domain with DKIM signatures, choose Enable.
  • Office 365, SPF, DMARC, DKIM, Outlook
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