If you want your account deleted, then post a request here:
http://www.codeproject.com/Forums/1645/Site-Bugs-Suggestions.aspx[
^] - only the admins can do that, and they read every message there.
If you want to stop receiving newsletters and so forth, then deactivate them in your settings: hover the mouse over your username at the top right of this page, and click on "My Settings" from the drop down that appears. There is a "Newsletters and Emails" tab which controls what you will be sent.