I have a favourite letter. It was one of my resignation letters. Paraphrasing what it said at its core "I would like to take this opportunity to tell you how much I enjoyed working here and that I would miss the wise and intelligent guidance I received while employed here. Unfortunately my mother raised me not to lie, so I won't."
I still love that letter.
Of course it contained a great deal more content than "X". (I mean seriously, he couldn't even add "O" to the mix?)
At breaking free of my last job after way too many years I used:
"To whom it may concern, I'm writing this letter to inform you that your employment services will no longer be required. . . However feel free to reach out for my consultant rates..."
I then quoted Maya Angelou: "I did then what I knew how to do. Now that I know better, I do better." (HR person said she liked this quote. I think my usage of it whooshed over LOL)
And pretty sure I sealed the deal with "So long and thanks for all the fish!"
(It was a library lmao)
But "X"? That's stupid. Unless there's buried treasure under it.