do not allow users to manually specify their notification email address, construct it from their username and the "EmailDomain" option

www/kojiweb/notificationedit.chtml

@@ -39,10 +39,6 @@
         <th>Success Only?</th>
         <td><input type="checkbox" name="success_only" value="yes"#if $notif and $notif.success_only then ' checked' else ''#>
       </tr>
-      <tr>
-        <th>Email</th>
-        <td><input type="text" name="email" value="#if $notif then $notif.email else ''#"/></td>
-      </tr>
       <tr>
         <td>
           #if $notif