10 Mordecai wrote in the name of King Xerxes, sealed the dispatches with the king’s signet ring, and sent them by mounted couriers, who rode fast horses especially bred for the king.

Read Esther 8:10 Using Other Translations

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:
And he wrote in the name of King Ahasuerus and sealed it with the king's signet ring. Then he sent the letters by mounted couriers riding on swift horses that were used in the king's service, bred from the royal stud,
The decree was written in the name of King Xerxes and sealed with the king’s signet ring. Mordecai sent the dispatches by swift messengers, who rode fast horses especially bred for the king’s service.