You may have never needed to install a mailbox or mail slot — chances are one or the other was already present when you moved into your home. But, if you have a roadside mailbox that is damaged, or if you have a mail slot and want to put in a new door, you will need to make sure the mail can still get through. Whether you need a mail box or a mail slot, the job is a simple one that can be completed in an afternoon with some basic tools.