sometimes you don't want new players to give you their oj for sending stuff they asked in giveaway and sometimes you only want to hoard items from townsfolk in your mailbox.
Regardless of what you want you we can all agree that the idea of asking people to "dumb" your mailbox seems kinda annoying at times so why not add the option to have a lock to our mailbox that prevents people from seeing the "Mailbox" option in your profile.
