[exim] relay all mail to 1 address and NOT real destinations

I'm trying to setup a development/staging environment for our web
application such that all emails are routed to 1 particular email address
instead of their real destination email addresses. This allows us to make
sure the emails were constructed properly, count them for testing the
correct number sent, etc.

How can I do this with exim?

--
Scott Mueller
AppleTree - Global Family
http://www.appletree.com