[exim] exim4 problem

Hi all;

I have started to use linux and exim few weeks ago.
Now i found this list and tought maybe i could get some answers to my dumb quetions :)

I decided to use openwebmail and exim4 compination. Now i have this problem.
I dont want to create an account for every user. Openwebmail has support for
mysql authorization so that works. But how can i make exim to deliver mail to
users which doesnt "exist".

Know there is a simple answer but just wont find it.
Im totally lost :P


-Happy
(Greetings from Finland)