Horizontal mailboxes were once considered the preferred, USPS approved choice for businesses and multi-tenant buildings. After changes were made to delivery standards in 2006, they became used for mostly private distribution without USPS approval. These units are still beneficial for those in need of a new horizontal units and can still be fully approved as a replacement unit. They continue to be a preferred choice among customers who have their mail hand delivered by carrier to business personnel and then distributed to each mail slot. These units are commonly used in universities, schools and business centers for the convenience of bulk deliveries to service large spaces. A solid aluminum structure and recessed style mount makes this ideal for in-wall installations that exude a clean, professional aesthetic. Our horizontal mailboxes can service a wide variety of users in a single block of compartments, custom configurations can be 5, 6 or 7 units high or 3, 4 or 5 wide. If your business prefers to sort mail internally or you need a replacement for your former horizontal mailboxes, your choice is clear with this traditional, high-functioning model. .