LDAP problem with retrieving email addresses

Experts,

I have the following LDAP query which retrieves all of the email addresses associated with a domain, in Actve Directory.  This works fine, however secondary email addresses are not detected, ie.  a user might have 5 attached email addresses, but the primary one is only retrieved.  How would I get all email addresses for each Active Directory object ( Users, Contact, Group etc..)???

System.DirectoryServices.DirectoryEntry entry = new System.DirectoryServices.DirectoryEntry("LDAP://" + dom);
System.DirectoryServices.DirectorySearcher mySearcher = new System.DirectoryServices.DirectorySearcher(entry);
mySearcher.Filter = ("(objectClass=*)");
 
foreach (System.DirectoryServices.SearchResult resEnt in mySearcher.FindAll())
{
     try
     {
          System.DirectoryServices.DirectoryEntry de = resEnt.GetDirectoryEntry();
          string emailaddress = de.Properties["Mail"].Value.ToString();
          Console.WriteLine(emailaddress.ToString());
     }
     catch (Exception ex)
     {
     }
}

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