[Exim] Virtual User table

Hi, Hope this is the right place (first post etc!) sorry if it's not.
I'm trying to set up exim to accept mail from 10 different domains, but
sort the users by the domain they come from.
so user@??? gets sent to the local user user-dom1.com
I got this working with sendmail using a virutalusertable

@dom1    %1-dom1@localhost 

is this possible with exim?
thanks in advance
Alex