Sealing a mail slot in a door

Shop door mail slots from Ace Hardware Our assortment of high-quality door and wall mail slots includes a range of materials and colors to match

Simple Pixelated Hounds-tooth Quilt Block The part that is flush with the door is closed as well, but has an opening for the mail slot

door with mail slot Stainless Steel Door Mail Slot with Extra Large Mail Catcher and Combination Lock - 11'' x '' Mail Slot Cover and Extra Large Mail Slot Catcher

door mailbox slot Doors, Skylights and Windows - Is there a way to replace a mail slot with a larger door for package delivery?