We will need to create the two CNAME records. – Navigate to your DNS records management We can now create the appropriate DNS records. Name: selector1._domainkey Value: selector1-contoso-com._ Name: selector2._domainkey Value: selector2-contoso-com._ Note the – instead of the. In the example below you can replace contoso-com with your domain name and with your domain. Click Create DKIM KeysĪll the DKIM Keys have the same format. Select the domain that you are sending mail from 3. Even though they all have the same format, this will make it easier to copy and paste the correct DNS record values If you don’t see the option Create DKIM Keys, then just go to the next step. We are first going to create the DKIM keys in the Microsoft 365 security center. If you don’t know how to change your DNS records, then contact your hosting provider to assist you. I am using Cloudflare as a DNS Hosting provider, which I will be showing in the screenshots below. ![]() ![]() Note You will need to follow the steps below for every domain that you want to enable DKIM for in your tenant. Keep in mind that it can take some time (from a couple of minutes to 24 hours) until the DNS changes are processed. To configure DKIM we need to have access to the DNS records. Microsoft 365 uses its default policy and 2048-bit public DKIM key for your domain if you don’t enable it yourself.īut when you have more than one custom domain, or also intend to configure DMARC (recommend), then you will need to manually set up DKIM in Office 365. Also when you have only one custom domain is configuring DKIM is not required. domain, then you don’t need to configure DKIM in Office 365. We will also look at configuring DKIM for domains that don’t send emails and I have a couple of small PowerShell scripts for you when you need to configure it for multiple domains. In this article, we are going to add the appropriate records to our DNS Hosting provider and configure DKIM in Office 365. ![]() When you have more the one custom domain in Office 365, then you really should configure DKIM, because the built-in DKIM Configuration in Office 365 is insufficient then. Where SPF is required to send emails from Office 365, is DKIM recommended to configure (together with DMARC). Together with SPF and DMARC, this prevents attackers from spoofing your emails. DKIM is the second authentication method that helps with verifying mail sent from your Office 365 is legitimate.
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