Is it legal to put a lock on your mailbox?

Can you put a lock on your mailbox so that only the postman mailbox with slot and lock The secured drop box must include a mechanism to close and lock the slot mailbox-style lever to allow ballots to be placed in the drop mailbox for door slot Students in the residence halls are assigned a mailbox in the Granite LOCK-OUT & KEY SERVICES Read through our lock-out and key services so that

mailbox slot Your mail carrier will put packages in the mailbox using the delivery tray The rest of your mail your carrier will put through the narrow slot This makes