It depends. In most cases emails kind of have a professional stigma following them and are sent to ask questions or to gain information or inform the receiver so it’s best presented in a formal way.
In other cases such as a letter to a friend it can be as informal as the writer would like. Overall though I would say False, emails require professionalism.
Answer:
This has us think of all the compliments we have received from others and/or ourselves, then start to think of the kind of person you shouldn't be. This can remind some of things they've done that still brings them guilt. It can help others recognize a narcissist by their response. It is all dependent on the response it's reader. It's helpful to those who don't recognize their own toxic behavior. All in all, this statement can have thousands of responses but only has one outcome, someone's true self showing.
Hope this helps!