Secured from Theft: Cluster Mailbox Units Protect Mail Behind Lock and Key
Cluster mailbox units, or CBUs, were first introduced by the United States Postal Service in 1967 as a method of central delivery to serve large buildings and, more infrequently, residential neighborhoods. Because the USPS carrier only has one stop to make at the CBU, this type of mail delivery and collection improves efficiency and provides security for the recipient’s mail.