A Spanish postal system, post office, or mail courier; also historically refers to a Spanish postal system in colonial territories.
From Spanish correo (mail, post), derived from correr (to run), referring to messengers who ran with mail. The system was established in Spain in medieval times and expanded throughout colonial empires.
Before email, correo was Spain's network of human couriers literally running across continents delivering messages—it was so organized that the Spanish could keep their empire connected across oceans and continents.
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