I wouldn't be mean about it. I'm imagining adding a line to the email such as:
> (Yes, I know this is annoying, but it's required by our insurance company.)
What is the insurance company going to do, jack up our rates because we accurately stated what their policy was?
I'm not saying you're wrong, I've never worked in a company this large (except for a brief internship), or in IT specifically. But also, like, come on people, grow up.