[Exim] listening and sending on another ip on the box

Hi there,
I would like to say that exim is unreal.
love the filtering side of it (we actually didn't even see the I love u
virus) but it was good to know that it wasn't coming through (can I also
make a suggestion, which is make the site searchable with htdig or
something hint hint :)
anyway my question is this.
is it possible to specify the smtp listening IP and sending IP. we have a
box that has a couple of IPs on it
and I would rather not use the primary ip for either SMTP in or out.
is this possible?
cya
Andrew