[exim] exim4 redirect

Hi there,

Previously with Exim 3.x I was using a director such as :

redirect:
driver = smartuser
local_parts = user
domains = domain.com
new_address = newuser@???

to take certain users from certain domains and redirect to a different
username and domain completely.

I have been playing around with something that will do the same thing in
Exim4.

Is a router the best way to do this? or is there an easier better method?

Regards

Nathan