[Mailman-Users] users getting mail twice

J C Lawrence claw at kanga.nu
Fri Sep 22 06:41:16 CEST 2000

On Thu, 21 Sep 2000 05:33:42 +0000 
Tom Goulet <tomg at nova.yi.org> wrote:

> Hello, When a user of my mailing list hits the 'g' key in most
> popular mailers, a reply is set up that addressed To:
> listuser at foo.bar, and CC: thelist at mymachine.

> The trouble is that user mentioned in the To: will receive the
> message twice.

This is correct and normal behaviour.  Additionally, it is
__expected__ behaviour.  In particular, many people aggressively
rely on this behaviour for lists that don't have Reply-To: set..
Mailman and your MTA, have no business intervening here.

Other reasons are functional

  It is possible to have Mailman track and fold/remove such extra
addresses from the mail broadcast.  The problem is that this is open 
to abuse.  Consider an open list (no posting controls).  I send a
message addresses to the list (From: header) and CC'ed to you (CC:
header).  However, because I'm using this message to tell lies about 
you I arrange the message envelope such that it only gets sent to
the list.  Result?  Everybody on the list reads my accusations and
you never see them.

  More subtle and interesting abuses abound (and aren't difficult to
think of).

J C Lawrence                                 Home: claw at kanga.nu
---------(*)                               Other: coder at kanga.nu
http://www.kanga.nu/~claw/        Keys etc: finger claw at kanga.nu
--=| A man is as sane as he is dangerous to his environment |=--

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