trouble with mail delivery

We are having trouble getting our postal carrier to divide the mail delivery at our building, a legal two family brownstone. There are two mailboxes set apart by the stoop (one up the other below). Our carrier says it is USPS policy that he only makes one delivery per building, that if we mounted the boxes side by side,he would separate the mail, but as it is, our mail will be co-mingled with the tenants and vice versa. Anyone have experience with this?

By clumpo |