[Exim] Exim + RAV

Hello,

I have got a main mail server running Exim4. I have to install another
server too for RAV Viruscheck, because leaving both of them on a same
server would extremly load up cpu states. Also as I know running RAV I
must use Exim3.x

Would you so kind to give me an advice how to pass all the messages for
a viruscheck to the secondary server, and when done how to send all of
them back to main server? After this the main server would deliver mails
to local mailboxes.

I read anything you suggest! :-)

Thank you so much!

Mihaly