title: Get AD Group User's email
body: <p>How we can retrieve the email id of the user who has belonged to a particular group. I have one application in which i need to send the email to a Security group from sharepoint. I got the list of users by using this code.</p>
  
  <pre><code>PrincipalContext principal = new PrincipalContext(ContextType.Domain);
  GroupPrincipal groupPrincipal = GroupPrincipal.FindByIdentity(principal,  picker.DisplayText);
  var members = groupPrincipal.GetMembers(true);
  </code></pre>
  
  <p>the members variable should returns the group users, So i need to pick each of the user's email id from this collection. Please help me to sort out this issue.</p>