P.P.S. Looking at this poem some months later I remember how much I wanted to use this analogy. Now I see it has a very wide drive a truck through it hole in it. Probably the King had someone to read his mail for him (at least the kings on earth, the kings of history). At least the incoming mail. The outgoing mail had to stamped with the King's own seal so it couldn't be tampered with generally, unless someone stole the seal and not being a very comprehensive student of history I do not know. All in all this was a horrible analogy to use as it doesn't fit with life on earth.
So I will just add here I am referring to some obscure fairy tale that hasn't come to light yet where the King, in fact, always commanded that he be the first to open his mail (break the seal, I guess that's how it was done way back when).