The topic you jumped on to is almost 3 years old and really would have been better to have started a new topic.
What avast version are you using (avast 4.8 Home/Pro or avast 5.0 Free/Pro/Suite), as there is no such setting in avast5, the current version ?
These emails are by subscription only so at some point in the past you would have to have subscribed to the service ?