[exim] Unrouteable to default mailbox

Hello,
I set up exim on my server. It managed a couple of "normal user", but I

used to communicate many other different addresses (ex: sale@dom, joke
@dom, friend@dom etc .... ) because I set up my old system to redirect
unknown user to a specific mailbox.
So: My question is it possible to redirect all unrouteable mail to a
specific mailbox ?
Thanks in advance ;-)
Marc