title: Is there a way to authenticate a user to LDAP with email/password?
body: <p><strong>Is there a way to authenticate a user to LDAP with email (mail)</strong> and not cn or DN?  We are using ruby ldap, and possibly active-ldap (we have been having problem with it, though).  All we need to do is authenticate a user and then create a membership in our system based on the authentication success.  </p>