Is it possible to soundproof a door with a mail slot?

Burglar unlocked door through mail slot door mail slot blocker An employee of Dear Sandy said they will be fortifying the security on their front door and removing their mail slot The suspect, Jon door mail slot catcher Shims & Setting Block · Spray Foam & Cleaner · Tape & Glazing Tape · Tools » · Auto Glass Door thickness: Up to 1-34'' Material: Anodized AluminumPlastic

door slot lock Stainless Steel Door Mail Slot With Extra Large Mail Catcher And Combination Lock - 11'' X '' Mail Slot Cover And Extra Large Mail Slot Catcher