It's simple to delete multiple contacts from your email All subscribers list, but it's also permanent.
- On the Campaigns page, click Subscribers.
- In the left sidebar, select the list that contains the contacts you want to delete.
- At the top of the page, check the Email box to select all of the contacts on the current page of the list.
- Also at the top of the page, check the Select X People box, and then click the trash can.