The correct response to this at the git-go is to say that your preferred gender pronoun is “the general” or “General sir”, or “your highness”.
To the email, I don’t have enough eveidence to be sure it is real. Not that I doubt that that doesn’t happen. I’d sue. I’d sue for the same reason a soldier got off the boat at Omaha beach on D-day. To risk my comfort to preserve the nation.
I guess I would fill mine out as:
My name is LORD.
My pronouns are He/Him/His ...