Convert Users into Functional Accounts
On Proofpoint, any email address that isn't an active user (former employees, distribution groups, etc.) is considered a "functional account." Any user account can be changed into a functional account by following these steps:
1. Log into Proofpoint, then navigate to User Management > Users on the left side of the screen.
2. Select the users you would like to change, then click “Mass Update Users.”
3. Change the Role drop-down to “Functional Account,” then click “Update Users” at the bottom of the window.