[Exim] return_path in autoreply

Hello Experts,

The autoreply driver, by default, sends <> for the envelope sender. Is
there any way to get it to put in an address? I'd like to know if the
autoreply bounces.

I've tried adding:

return_path_add
return_path=doorman@???

user=doorman was in the router.

But the message still arrives with <> for the Return-path: header.

What am I doing wrong here?

I guess I could do it by piping to a little program but that seems inefficient.

Thank you for any advice.

Marilyn Davis