When it comes to picking the size, there are really no rules. If you're the type of person who gets larger packages and likes your accessories to make a statement, then a larger, bolder-color box is probably right for you. If you would rather your design elements blend together, then a smaller box might be just right. Either way, it's a good idea to tape off the measurements of the box you are considering on the potential spot with masking tape. This will help you get an idea of how much space you'll really be using. If you'd prefer not to have a mailbox at all, a mail slot in your front door is always an option.