Follow these steps:
You can add him/her to your Block List. If you add someone to your Block List, you won't receive any more messages from him/her.
1. If you've just received a message from the person or if the person still appears in the
Not In List group (on the bottom of your contact list), open a message window with the person and click the
Block link.
Note: This option is only available in the message window when the message is from a user that is not on your contact list.
2. A warning message will be displayed after you click the link, explaining that the user will be added to your Block List. To confirm click
YES.
