1. Click Management
  2. Under Database Configuration, click User Defined Fields 
  3. Click the Category you want to save this new User Defined Field in (Ex: Base)
  4. Under the Tasks menu, click New Defined Field
  5. Name the field Mailing Status
  6. Set the Data Type to Text
  7. Click Next
  8. Under Field Application, mark the checkbox next to Constituents (do not mark any other checkboxes)
  9. Click Next
  10. If you would like to utilize the Field Attributes then mark the appropriate checkbox (not recommended)
  11. Click Next
  12. Under Display Type, select Selection from a set of values
  13. Click Next until you are on the the Values step
  14. In the Name field type in Do Not Mail
  15. Click Add Value
  16. Repeat this step until you have added all of the values you need (Deceased, Bad Address, Inactive Account, etc.)
  17. Click Save and Finish