If you find yourself the focus of some very unwanted attention, you can block that person from messaging you in the future.
- Access the last message the member sent you.
- From the menu, select Block This Person.
If you have a change of heart, or they have a change of personality, you can always unblock them. Head over to Edit Profile > Mail Settings and view your list of blocked profiles. Select the person and unblock them to welcome them back into your life.