1. Navigate to Lists > Manage Lists.
  2. Click the Manage basic and advanced lists block under List Actions. 
  3. Locate and Edit the list, and click the Output Options tab.
  4. Under Mail Labels, select the User Base you wish to base the mail labels on. For example, if you want to base the mail labels on student information in the list, select the User Base associated with the students within your list.
Tip: If you don't know which User Base to use, check your Display Fields tab to see which User Base is associated with the student.