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From: mrose@nrtc-gremlin.arpa (Marshall Rose)
Newsgroups: comp.mail.headers
Subject: Re: rmail-reply-to-sender
Message-ID: <859@brl-adm.ARPA>
Date: Mon, 17-Nov-86 16:46:48 EST
Article-I.D.: brl-adm.859
Posted: Mon Nov 17 16:46:48 1986
Date-Received: Mon, 17-Nov-86 22:06:35 EST
Sender: news@brl-adm.ARPA
Lines: 23

Well, only Dave Crocker knows for sure, but I think this interpretation is
correct:

New message (reply)		Old message (being replied to)
------------------		------------------------------
To:				use Reply-To: if present,
				otherwise use From: if present,
				otherwise use Sender: if present
				otherwise use Return-Path: (gag)

cc:				use To: and cc: if present
(including a cc: is at the
user's option-- some people
prefer to omit the cc:)

For an example of the rules that MH uses, look at the standard "replcomps"
file distributed with MH.  This is a "simple" formatting facility which
builds the reply draft for the user.

Note that the answer to your "have CC's get replies if I use REPLY-TO" query
depends on the recipient of the message, NOT the sender.

/mtr