[exim] simple "forward" configuration

dear users
i will use exim as server for incoming mails, which only should be check
mails for spam, virus etc, (and accept only the domains which we want to
accept) and then delive it to an internal server (he delivers then the mails
to the mailboxes).

Example
server 1 and internal server
Incoming mail on server 1 > domain.com > scanning for spam etc, > deliver
it to internal server (he can then reject it or not, depends if user are
correct or not).

anybody has a simple example for such a config, i just begun to read docs
of exim and official doc , but its a little bit more complicate with ACL
then sendmail.
thx and friendly regards