The insurance people are not a part of the company, so I'm not sure who would be offended.

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?

The problem is that this particular insurance company was picked by someone who does work in yours.