maildrop stand alone with exim -- forwarding

"Raveendra Reddy B. via Courier-maildrop" <[email protected]> Tue, 11 Jun 2019 12:25:30 +0000 (UTC)
Newsgroups gmane.mail.maildrop
Message-ID <[email protected]>
Hi,
I am trying to set up forward with local copy.  I have got the following recipe from serverfault.com as well as maildrop man page.
if ( /^From:.*domain\.com/:h ) {
  cc "[email protected]"
}
However, while forwarding return-path is becoming null (<>).  I am not getting any lead on how to handle this.Could some one help me on this.
Thanking you,B Raveendra Reddy, Chennai

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