Knowledge Base

How to configure a CodeTwo domain in Office 365


After you registered your Office 365 tenant in CodeTwo Admin Panel, a new accepted domain was added to your Office 365 tenant:

[your unique ID]

When you view this domain in your Microsoft 365 admin center (Office 365 admin center), the domain may have the Incomplete setup (previously Setup in progress) status (Fig. 1.). Also, Office 365 may send you various notifications or display warnings related to this new domain.

639-1 New CodeTwo domain
Fig. 1. The new CodeTwo domain added to Microsoft 365.


The CodeTwo domain is necessary for CodeTwo Email Signatures for Office 365 to work correctly. Do not remove it from Microsoft 365. If you did, contact us.


This new domain is used to relay your messages and improve your email security (our software uses TLS certificate-based connectors). After the domain is created, it has the Incomplete setup status. You can ignore this and related Microsoft 365 notifications because CodeTwo Email Signatures for Office 365 is configured and working correctly. Your mail flow and email signatures are not affected by this status. The Setup in progress status remains because the API used by our software does not allow us to change it in your tenant. If you want to change this status and stop notifications, you can do it yourself in the Microsoft 365 admin center:

  1. Open your Microsoft 365 admin center and go to Settings > Domains (Fig. 1.).
  2. Click the CodeTwo domain that has the Incomplete setup status.
  3. A setup wizard opens. Click Continue setup (Fig. 2.).

639-2 Continue setup
Fig. 2. Opening the domain setup wizard.

  1. Click Continue (Fig. 3.) to go to the next step of setting up your domain.

639-3 How to connect your domain
Fig. 3. The opening screen of the Domain setup wizard.

  1. You should land on the Add DNS records page. Clear the Exchange and Exchange Online Protection checkbox and click Next, as shown in Fig. 4.

639-4 Deselect Exchange
Fig. 4. Deselect Exchange and Exchange Online Protection and click Continue to complete the configuration.

  1. The wizard confirms that the configuration is successful (Fig. 5.). You can click Done to close the wizard window.

The configuration of the CodeTwo domain is complete.
Fig. 5. The configuration of the CodeTwo domain is complete.

  1. Back in the Domains settings page, the status of the CodeTwo domain changes to Healthy (previously Setup complete), as shown in Fig. 6. Microsoft 365 should not send you any domain-related notifications or display warnings anymore.

CodeTwo domain correctly set up in Microsoft 365.
Fig. 6. The CodeTwo domain correctly set up in Microsoft 365.