23 Aram “lord of the command.” So also in vv. 9, 17.
24 Like Rehum, Shimshai was apparently a fairly high-ranking official charged with overseeing Persian interests in this part of the empire. His title was “scribe” or “secretary,” but in a more elevated political sense than that word sometimes has elsewhere. American governmental titles such as “Secretary of State” perhaps provide an analogy in that the word “secretary” can have a broad range of meaning.
25 Or perhaps “against.”

In other versions

Rehum the commander and Shimshai the scribe wrote a letter against Jerusalem to Artaxerxes the king as follows:

Rehum the commanding officer and Shimshai the secretary wrote a letter against Jerusalem to Artaxerxes the king as follows:

Rehum the chief deputy and Shimshai the scribe wrote a letter to King Artaxerxes concerning Jerusalem as follows:

Rehum the governor and Shimshai the court secretary wrote the letter, telling King Artaxerxes about the situation in Jerusalem.

Rehum the royal officer and Shimshai the scribe wrote a letter against Jerusalem to King Artaxerxes as follows

Rehum the chancellor and Shimshai the scribe wrote a letter against Jerusalem to Artaxerxes the king in this sort:

Public Domain