A post house, posthouse, or posting house was a house or inn where horses were kept and could be rented or changed out. Postriders could also be hired to take travellers[1] by carriage or coach and delivered mail and packages on a route, meeting up at various places according to a schedule. Routes included post roads. A postmaster was an individual from whom horses and/or riders known as postilions or "post-boys" who might help a coachman drive coaches could be hired. A postilion might also travel on a coach to take back his employer's horses. The postmaster would reside in the post house.[2]
Post houses functioned as the post offices of their day as national mail services came later.