p3scan clustering , POP3 server outside the domain

Hi 
   I would like to get feed-back and advice on a  UM
setup which I am planning to do 

  I have to set up “p3scan “  load balanced  as proxy
server for  a Mail Server , which is outside my domain
, and where I do not have any control on it. Also I do
not have control on the mail clients 

 With out UM , my setup is as 
(1)When the mail client accessing the Mail Server
(which is outside my network ) the 110 port packets
get routed to the p3scan machine and it scans the
mails . It acts transparently and it works fine

Now my concern  of using UM is 
     Since I cannot change the mail client settings ,
when they access POP3 server , from the router I am
re-routing he packets via  Virtual IP address .  After
this my p3scan  does not work .  In this scenario can
I make p3scan clustered and work.
                 Guidance requested 
                           Thanks 
                                 Joseph John 

                               


		
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