[Exim] virtual domains

Hi,
It's about virtual domains etc.
So far i did that:
local_domains = myloveddomain.com:\
                dbm;/etc/vdomains/virtdomains.dbm
and that:
virtual:
    driver = aliasfile
    domains = dbm;/etc/exim/vdomains/domains
    file = /etc/exim/valiases/$domain
    search_type = lsearch
That works if there is at least one
real, non-root  UNIX User, but Exim shout deliver
mail's for Users with just a Mailaccount
to the local IMAP Server, where they'll
wait to be fetched.
Could somebody please set me on track ?
Linux System is woody exim is 3.