[Exim] redirecting mail from one domain to another

Hi,

I've got a version 3.34 machine that I need to set up redirection on - no,
this can't be upgraded to 4.x at the moment - and Q0444 of the Exim3 FAQ
doesn't help as this machine is a gateway only and has no local domains.
Domains can't be moved onto this machine.

Is there a router driver, like "redirect" on Exim4, on Exim3?

Thanks for any leads

Dan