DKIM Records for Office 365

February 23, 2024 Info

To set up DKIM records for Microsoft Office 365 customers, you need to follow a series of steps to ensure that your email messages are securely signed and can be verified by the recipients' email systems. This process helps in preventing email spoofing and phishing attacks. Here's a general overview of how to set up DKIM for Office 365:

1. Enable DKIM in Office 365: First, you need to enable DKIM within the Office 365 admin center. This involves generating the DKIM keys for your domain(s).

2. Generate DKIM Keys: Office 365 automatically generates DKIM keys for your custom domain(s). You do not need to manually create these keys.

3. Publish DKIM DNS Records: Once the keys are generated, you will need to publish two DKIM DNS records for each domain in your DNS hosting provider (e.g., GoDaddy, Namecheap). Office 365 provides you with the specific DNS records to add. These records are typically CNAME records that point to Office 365's DKIM signing service.

   • The format for the CNAME records usually looks like this:
   • Selector1._domainkey.domain.com CNAME selector1-domain-com._domainkey.o365domain.onmicrosoft.com.
   • Selector2._domainkey.domain.com CNAME selector2-domain-com._domainkey.o365domain.onmicrosoft.com.

4. Enable DKIM Signing: After adding the DKIM DNS records to your DNS host, go back to the Office 365 admin center to enable DKIM signing for your domain(s). This tells Office 365 to start signing outgoing emails with the DKIM signature.

5. Verify DKIM Setup: You can verify that DKIM is working correctly by sending an email from your domain to an external email address and inspecting the email headers for a DKIM signature that matches your domain.

It's important to note that DNS record propagation can take some time, so the DKIM setup might not work immediately. You might need to wait a few hours for the DNS changes to take effect globally.

For detailed instructions, it's always best to consult the official Microsoft documentation, as the process can change and there may be specific instructions for your situation. If you're not comfortable making these changes yourself, consider seeking assistance from a professional with experience in configuring DNS and email authentication methods.

Microsoft" href="https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/email-authentication-dkim-configure?view=o365-worldwide" target="_blank" rel="noopener">To read more about DKIM, visit Microsoft

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