How to stop receiving Ubuntu Answer emails?

I notice that several people have subscribed to Ubuntu Answers and they receive emails for every question submitted.
There have been cases that people got very much annoyed by this, and could not even communicate the issue.

If you subscribed by accident to Ubuntu Answers, you can log on to your launchpad.net account and then visit
https://answers.launchpad.net/ubuntu/+answer-contact

Here it will show you if you are the answer contact for the item "Ubuntu" (Ubuntu-related questions).
To unsubscribe, untick the option (be an answer contact) and click ok.