Rehum the chancellor, and Shimshai the scribe, wrote a letter against Jerusalem to Artaxerxes the king in this sort. This means the same letter as before; which, according to Jarchi, was sent in the name of Mithredath Tabeel and his company, was endited by Rehum, master of words or sense, and written by Shimshai the scribe, whom he makes to be a son of Haman i; but it was written rather in all their names.
i So Midrash Esther, fol. 85. 3.