It would be beneficial for both company and user to be able to choose which subscription type will appear when a user accesses the page to manage their email subscription preferences.
For example, when an individual salesperson (John) sending a one to many email, the user is given the option to unsubscribe from John's email list, but not the rest of the salespeople, because 1. they will not receive emails from the rest of them ever, and 2. the list of names clutters the screen and has bad UX.
