How to Install a Mailbox: Curbside Setup
To install a curbside mailbox, choose a location approved by your local postal authority, set the mailbox 41 to 45 inches from the road surface to the bottom of the mail entry, and place it 6 to 8 inches behind the curb. Secure the post according to its instructions, mount the box, then check that the door opens and the carrier has clear access.