Note 3 — I. Posts—Post-Offices, Ancient and Modern.
Reading edition
“And he wrote in the king Ahasuerus’ name, and sealed it with the king’s ring, and sent letters by posts on horseback, and riders on mules, camels, and young dromedaries.”—Esther viii. 10.
“There is no doubt every available means of conveyance were adopted to carry these important letters throughout the kingdom, as the greatest speed was needful in the emergency. He sent men on horseback, and upon other creatures as swift as horses, and upon mules, both young and old, according as the places were nearer or farther off. So he ordered the letters to be sent by post.”—Bp. Patrick.