Need some help on this one please. I have a customer who moved into a house that has been vacant for over 5 years and there hasn't been a mailbox on the house for that whole time. I told the customer the new mailbox needs to go at the curb but he refused and put it on the house . I haven't serviced it yet. Probably 80% or more of the boxes on that street are curbside. Am I correct in insisting the box go curbside? Is this covered in a manual?