[exim] Help: SMTP Authentication

    Hello Everyone,
   Please help me out, I am stuck with SMTP Authentication.  My SMTP
   Authentication is working but I am unable to force user using SMTP
   Authentication.  Both Helo and Ehlo are working.  I need to have only
   Ehlo to restrict my users to SMTP Authentication.
   Please help me. I am attaching my exim.conf for your kind
   consideration.
   Regards,
   Faisal