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From: GUMBY@mit-ai.arpa (David Vinayak Wallace)
Newsgroups: comp.mail.headers
Subject: semantics of Reply-To:
Message-ID: <865@brl-adm.ARPA>
Date: Mon, 17-Nov-86 17:33:39 EST
Article-I.D.: brl-adm.865
Posted: Mon Nov 17 17:33:39 1986
Date-Received: Mon, 17-Nov-86 22:07:11 EST
Sender: news@brl-adm.ARPA
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    Date: Mon, 17 Nov 86 11:07:45 pst
    From: Scott J. Kramer <sjk at grape.ads.arpa>

    Speaking of mail replies, there's an annoyance related to using a
    REPLY-TO field, which I currently use because the host I'm sending
    from isn't recognized on the Internet.

    When the recipient responds to a message with a REPLY-TO which also
    has CC addresses, the CC's are omitted in the reply; only the REPLY-TO
    address is used.  RFC822 isn't specific about this; it just says "if
    REPLY-TO exists, then the reply should go to the addresses indicated
    in that field and not to the address(es) indicated in the FROM field."

    I'm CC'ing Header-People on this since someone there may know of a way
    to do what I'm trying to do (ie, have CC's get replies if I use
    REPLY-TO).  From what I can tell, the only way is to have a valid FROM
    field.

Reply-To: means send replies to this address.  If there's no Reply-to:
then your mail reader should compose a reply to the union of CC and
From.  If you're sending from a host which for some reason won't
identify itself usefully, specify a From:.  Hopefully your mailer will
set the Sender: field to be the invalid address, ut preserver the
From:.

In other words, gnu emacs is doing the right thing; you should use
From: where you now use Reply-to:.