To create a suppression list for hard-bounced email addresses, the most direct approach is to query the Bounce Data View in SQL. This Data View contains all bounce-related information, allowing admins to specifically filter for hard bounces by the bounce category. Using a query activity, the admin can extract all hard bounce records and create a dynamic or static suppression list based on these results. This method is efficient and ensures that only relevant data is included in the suppression list.