You can monitor your user group's email traffic and devices through the UEM console Email Dashboard. This dashboard gives you a real-time summary of the status of the devices connected to the email server. You can access the dashboard from Email > Dashboard.
From the dashboard, you can also use the available graphs to filter your search. For example, if you want to view all the managed devices of an organization group, select the Managed Devices graph. The graphs display the results in the List View page.