However, final users in a corporate environment should be taught that if they get a message with a lot of information, and they don't understand that information, it's not for them,
THIS! THIS SO MUCH! And that's why I took over training all new employees. I teach them how to think. And every time I've fixed a problem, I explain to users what happened. As a result, my overall number of tickets has decreased and my users are now better equipped to solve their own issues.
I shit you not, I've had a user do worse.
I've done the same exact scenario as you with one difference. I told her the same thing you did. And then. She closed the message again. While I was pointing at it, and asking her to read it out loud.
I.
Pointed. At the screen. And said read this out loud.
She moved her mouse to my finger.
And closed the message.
I.
Can't.