Sign in to your administration portal, select the main domain concerned, and navigate to Administration => Microsoft 365.
Click on Automatic, direct link:
Deployment Portal-
Click on Sign in with Microsoft.
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Enter the administrator account of your Microsoft tenant.
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Then click Grant permissions.
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Select the administrator account of the Microsoft tenant.
Accept the terms and conditions.
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Click on Deploy.
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Copy the ID and go to Entra using the Access role assignment link.
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Click on Add assignments, and in the search bar, paste the ID.
Example:
After adding the application, close the Microsoft window and return to the e-securemail interface to continue the deployment.
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Check the box “The Exchange role has been assigned to the application”.
Select the relevant domain(s).
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Select your quarantine policy (modern version recommended).
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Wait for the installation to complete, then exit by closing the browser window.