There are several types of centralized mail delivery systems supported by the United States Postal Service (USPS), including STD-4B mailboxes. Like all centralized mail delivery systems, STD-4B mailboxes don't consist of individual and separate mailboxes. Rather, they consist of a single wall-mounted unit that contains multiple mailbox compartments. If you're unfamiliar with the STD-4B mailboxes, keep reading to learn more about this traditional centralized mail delivery system and how it works.
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