dumb USPS mail question- outgoing mail door slot?

The one-piece Vertical Mail Slot fits discretely into any wall or door with ease The two-piece Standard Mail Slot comes with an interior trim kit and is

Each mailbox is designed with an individual name tab on each slot, making it easier for you to keep things organized This allows you to assign slots by name,

mailbox slot for door Mail slots vs Traditional Mailboxes A person putting a piece of mail through a mail slot on a wood door

mailbox door slot Wall-mounted or attached mailboxes may also be used in place of mail slots, usually located close to the front door of