Check the data source of the List in question.
Lists with data source "User Defined" are not available to be selected as Target Lists in email Appeals
To send an Appeal to the desired addresses as a Target List:
 

  1. Create a new email List with one of the following data sources
    • Constituents
    • Applicants
    • Education Edge Persons
    • Faculty
    • Individuals
    • Students
    • Imported Lists
  2. Add the desired addresses to the new List using the method that corresponds to the data source that you selected for the new List
  3. Save the new List
  4. In the Appeal, select the Target Lists tab
  5. Click the Insert Target List button
  6. In the Select Lists window, select the List that you saved in step 3