[Exim] exim 4 .. accept mail for unknown users in my domain

Hi All,
I have upgraded from exim 3.36 to exim4.12.
What do I need in my exim.conf to accept mail for unknowns users in my
domain, and send all that mail to kerry@????
There was a "userunknown" director in 3.36.
Cheers,
Kerry.