[Exim] set return path in forward router

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Hi Guys,

have searched the whole morning, but unfortunally my keywords where wrong.

What i wanna do is when a mail gets forwarded by a .forward file,
the Return-path should be real-username@??? of the user who has the
.forward file. At now Return-Path is same as From.

I have set it up with smail (want to change to exim):

dotforward:
        driver=forwardfile,
        owner=real-$user,          # problems go to the user's mailbox

Now I need the same for exim.

sincere thanks

    Martin

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