I note you are telling me two different things in Comments #2 and #3.

Comment #2 says
In addition to the list address & his address, the address that appears in the 
email header as well is:
Accessibility at mailman dot midimag dash xt dot org
which is a thoroughly bogus address.

which says there are 3 addresses in (I assume) Reply-To: of the post
from Mailman.

Comment #3 says
the reply-to: header contains the list address &, instead of his email address, 
there's an address Accessibility at mailman dot midimag dash xt dot org instead 
of his actual email address.

which says there are only 2 addresses in Reply-To: of the post from
Mailman.

I'd like to see the raw headers of the mail from the list. If you don't
want to post them here, you can mail them to [email protected].

Here's an example of full headers of a mail to a list:

>From [email protected] Mon Jul 18 22:57:00 2016
Date: Mon, 18 Jul 2016 22:57:00 -0700
From: Mark Sapiro <[email protected]>
To: [email protected]
Subject: Test mail
Message-ID: <[email protected]>
Reply-To: [email protected]
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
User-Agent: Mutt/1.5.24 (2015-08-30)
Status: RO
Content-Length: 147
Lines: 4


And the headers of the mail from the list

>From [email protected]  Mon Jul 18 22:57:14 2016
Return-Path: <[email protected]>
X-Original-To: [email protected]
Delivered-To: [email protected]
Received: from [127.0.1.1] (localhost [127.0.0.1])
        by msapiro.net (Postfix) with ESMTP id E6AC234028D
        for <[email protected]>; Mon, 18 Jul 2016 22:57:10 -0700 (PDT)
X-Original-To: [email protected]
Delivered-To: [email protected]
Received: by msapiro.net (Postfix, from userid 1000)
        id DEC133402D7; Mon, 18 Jul 2016 22:57:00 -0700 (PDT)
Date: Mon, 18 Jul 2016 22:57:00 -0700
To: [email protected]
Message-ID: <[email protected]>
MIME-Version: 1.0
Content-Disposition: inline
User-Agent: Mutt/1.5.24 (2015-08-30)
X-msapiro-MailScanner: Found to be clean
X-msapiro-MailScanner-SpamCheck: not spam, SpamAssassin (not cached, score=0,
        required 6, autolearn=not spam,
        NO_RELAYS -0.00, URIBL_BLOCKED 0.00)
X-Spam-Status: No
Subject: [List1] Test mail
X-BeenThere: [email protected]
X-Mailman-Version: 2.1.22
Precedence: list
List-Id: My List one <list1.msapiro.net>
List-Unsubscribe: <http://msapiro.net/mailman/options/list1>,
        <mailto:[email protected]?subject=unsubscribe>
List-Archive: <http://msapiro.net/pipermail/list1/>
List-Post: <mailto:[email protected]>
List-Help: <mailto:[email protected]?subject=help>
List-Subscribe: <http://msapiro.net/mailman/listinfo/list1>,
        <mailto:[email protected]?subject=subscribe>
From: Mark Sapiro via List1 <[email protected]>
Reply-To: [email protected], My List one <[email protected]>
Cc: Mark Sapiro <[email protected]>
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Errors-To: [email protected]
Sender: List1 <[email protected]>
X-msapiro-MailScanner-ID: E6AC234028D.AFCF3
X-msapiro-MailScanner: Found to be clean
X-msapiro-MailScanner-SpamCheck: not spam, SpamAssassin (not cached,
        score=-0.999, required 6, autolearn=not spam, ALL_TRUSTED -1.00,
        URIBL_BLOCKED 0.00)
X-msapiro-MailScanner-From: [email protected]
X-Spam-Status: No
Status: O
Content-Length: 275
Lines: 9

This is Mailman 2.1.22+, but I think the only difference from 2.1.16 is
the original From: would be added to Reply-To: instead of Cc: except the
address is already there because of the original Reply-To: and
first_strip_reply_to = No so it wouldn't be added a second time.

-- 
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Coders, which is subscribed to GNU Mailman.
https://bugs.launchpad.net/bugs/1604181

Title:
  mangled reply-to: header when a reply-to: header exists

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