Problem with fetchmail and RCPT TO header

Hi

I am trying to configure fetchmail to pull mail from a remote server
direct to an exim mail server running locally.

The mailbox has several email addresses so I don't want the mail to all
go to one mailbox.

After a lot of investigation fetchmail seems to be rewriting RCPT TO
addresses to user(_at_)localhost (user that invokes fetchmail)

Therefore when exim gets this it sends only to that user

Is there any way to disable this