This is **Harassment**. The most inappropriate and totally unacceptable type of behavior in a corporate culture. **You cannot ignore this email, this behavior has no place in any company.** 

**What to do?**

Most companies have an anonymous line to report such incidents. It is usually a website, so that you do not need to use your own name or email. 

If her company does not have that, HR is the place to go. Some companies have a board of business ethics, that would be another option. (I met such a board when I married my customer, they were independent and pragmatic.)

**Why do it?**

Because this senior person is a threat to the company, its people, its customers and its reputation. It is not only your friend who was insulted, it is also the company that has been compromised.