What is another word for "courier"?

Roget's Thesaurus (1911) lists these synonyms for "courier": ambassador, annotator, apparitor, bag, bearer, bellman, boy, cable, carrier, chore, cicerone, commentator, commissionaire, correspondent, crier, dak, delivery, demonstrator, diplomatist, dragoman, electronic, emissary, envoy, errand, estafette, explainer, exponent, expositor, expounder, express, flag, gentleman, glossarist, herald, information, informer, internuncio, interpreter, legate, letter.