I've figured this out after some digging in the specification manual....
What I did:
add the following option to the remote_smtp transport:
headers_add = "Reply-To: $sender_address_local_part@???"
--Tim Lank
----- Original Message -----
From: "Tim Lank" <timlank@???>
To: <exim-users@???>
Sent: Tuesday, July 01, 2003 8:46 PM
Subject: [Exim] rewriting rule for non-existent Reply-To: field
> This is a multi-part message in MIME format.
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> Exim users:
>
> I have a need to add a Reply-To: field on incoming mails that are being
re-written. The problem that I'm running into is that the incoming mails do
not have a Reply-To: field at all.
>
> How can I do this?
>
> Thanks in advance for your help,
> Tim Lank
> timlank@???
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>
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