Giving Permissions to Distribution List in Exchange 2013
You can define additional permissions like “Send on Behalf” or “Send As” by clicking on Permissions section within the specific Distribution List from within the Control Panel.
1. Goto the specific Distribution List.
2. Click on Permissions Tab.
3. Click on Add button in relevant section.
4. Once you click on Add button; you will see list of users.
5. Select the user for which you want to give permission.