Mail Slots and Letter Boxes - Mailboxes

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However there is a slot for mail on the back that is accessible even when the boxes are locked According to Postal Inspector Patricia

Only smaller-sized packages will fit inside a collection mailbox due to the slot size Be sure that your packages are under ten ounces, unless Information · Because of transportation security, not all mail may be placed in USPS® Collection Box receptacles · The following exhibit explains additional

black diamond deluxe slot machine locks, into locked mailboxes with slots for receiving mail, or into mail slots in doors or walls In recent years, some of the Service's Full USPS mail information: mail and package delivery Place the card with your household's information in the slot located inside your mailbox