A letter plate for a mailbox is a metal or plastic plate that is attached to the front of a mailbox.

The letter plate is designed to make it easier for postal carriers to put mail in the mailbox, as they can insert the mail through the letter plate without having to open the mailbox itself. The letter plate is often made of steel or brass and is designed to be strong and durable.

Some letter plates also have a flap or cover that can be opened to remove mail from the mailbox. Letter plates for mailboxes are often used on houses or apartments to give postal carriers access to the mailbox without having to knock or ring. They can also be used on offices or other buildings to give postal carriers access to the mailbox.