DKIM is an email authentication method that allows the recipient's server to verify the authenticity of an email's source. It works by adding a digital signature to outgoing messages, which can be verified using a public key published in the sender's DNS records. This helps prevent email spoofing and protects your brand reputation.
Before setting up DKIM for Office 365, ensure that you have administrative access to your Office 365 account and access to your domain's DNS settings. It's also crucial to have a valid domain name associated with your Office 365 account.
1. Login to the O365 admin panel
2. Go to your Defender account (Security).
3. On the portal, navigate and click on Policies & Rules under Email & Collaboration.
4. On the Policies & Rules page, select Threat policies.
5. Select Email Authentication Settings.
6. Now select DomainKeys Identified Mail (DKIM) to open the DKIM page.
7. On the DKIM page, select the domain you want to enable DKIM for (this is the domain you use to send outbound messages).
8. To begin the DKIM activation process, flip the Enable button.
9. To view your keys, simply click the Create DKIM keys button.
10. A pop-up will now display your DKIM records.
11. Click on the “Copy” button to copy records to your clipboard.
12. You would get an error where they provide you with some records that need to be placed in DNS. Those records look as below.
Host: selector1. _domainkey
Value: selector1-example.com._domainkey.example.onmicrosoft.com
Host: selector2. _domainkey
Value: selector2-example._domainkey.example.onmicrosoft.com
After updating those records in DNS. retry to enable it. DKIM will be enabled.
By following the step-by-step process outlined above, you can successfully set up DKIM for Office 365 and ensure the authenticity of your outgoing emails. Implementing DKIM along with DMARC and SPF adds an additional layer of protection against phishing attacks and helps maintain your organization's credibility.
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