Impersonation rights are required for an SESC service account user. The impersonation right enables the service account to access the mailbox on selected exchange mailbox server in the user scope. It also enables the service account to create folders for submission and read submitted emails from these folders.
You can use any of the following commands to provide impersonation rights:
The service account user must have the Application Impersonation (RBAC) right. You can run the following command from Exchange PowerShell to provide this permission: