...
You must add a new contact from your account in the "Contacts" tab.
"Read and Manage" permission must be granted for the person you are adding.
To add more than one contact to your list, you may "Import Contacts".
The "EWS" service must active on in Exchange Server. https://blogs.msdn.microsoft.com/deva/2011/12/01/how-to-get-the-ews-endpoint-url-from-outlook-20072010/
...
Viewing Emails Based on User Permissions
Users who login to GEODI can view an indexed email if they are listed the From, To, CC or BCC fields of that email.
Otherwise, only the system admin can view the email.
You can contact our technical team for support in implementing this feature.
.