Deleting a Newsletter Distribution List
To delete a subscription list:
Go to Email & Newsletters / Lists.
Select the List you want to delete.
Click the red "delete" button in the bottom right corner.
It's important to note: If a parent has unsubscribed from your newsletters sent from the list you delete, and you make a new subscription list that includes them, the parent's "unsubscribed" status will not be transferred to the new list.