[Exim] Exim and Fetchmail

Hi all,
i'v got a little problem with exim and fetchmail.

So I have a pop3 account with unlimited alias on (a "catch all" account),
this account is for domain @mydomain.net

The thing I want to do is to retrieve all my message from this account and
deliver it directly to Exim as a normal incoming message on the port 25.

I have tried fetchmail with option --invisible however the mail is always
delivred to root@localhost while the incoming mail is for foo@???
Foo is a normal user with his home...

Does anyone have an Idea????