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What Are the USPS Mailbox Space Requirements? usps mail slot They look like glass-fronted tubes with small slots to let people drop their letters, postcards, etc The postal workers affix these USPS mail usps mail slot A slot or opening where customers deposit mail Package Drop Units A new form of collection receptacle that the Postal Service™ has

ids slot As explained in the USPS glossary, mail carriers complete their regular “carry-out mail” and then defer to the relay box to grab additional mail