The couriers rode out in haste on their royal horses, pressed on by the command of the king. And the edict was also issued in the citadel of Susa.
KJV
[So] the posts that rode upon mules [and] camels went out, being hastened and pressed on by the king’s commandment. And the decree was given at Shushan the palace.
ASV
So the posts that rode upon swift steeds that were used in the king’s service went out, being hastened and pressed on by the king’s commandment; and the decree was given out in Shushan the palace.