[Exim] working on headers

Hi,
I wonder if anyone on this list can give me a little bit of advice. Is it
possible (using exim 3.33) to (using a director) examine the headers of an
email recieved, and depending on a specific header / patern being found apply
one of two transports?

I would need to pass (presumably using a transport) some mails (with the above
metioned header) on to another mail server (that is not a listed mx). any
ideas for this too?

If it is possible does anyone have any little examples that they are willing
to share?


All the best,
Antony Carr