Mailman forwarding (was: Don't feed the troll...)

[W. Trevor King]

On Sat, Jun 15, 2013 at 01:07:29PM -0400, D'Arcy J.M. Cain wrote:
> On Sat, 15 Jun 2013 18:41:41 +0200 Chris “Kwpolska” Warrick wrote:
> > On Sat, Jun 15, 2013 at 5:40 PM, Steven D'Aprano wrote:
> > > In the name of all that's good and decent in the world, why on earth
> > > would you do that when replying to a mailing list??? They're already
> > > getting a reply. Sending them TWO identical replies is just rude.
> > 
> > Mailman is intelligent enough not to send a second copy in that case.
> > This message was sent with a CC, and you got only one copy.
> 
> Actually, no.  Mailman is not your MTA.  It only gets the email sent to
> the mailing list.  Your MTA sends the other one directly so Steve is
> correct.  He gets two copies.  If his client doesn't suppress the
> duplicate then he will be presented with both.

Mailman can (optionally) assume that addresses listed in To, CC, …
fields received an out-of-band copies, and not mail them an
additional copy [1].

Cheers,
Trevor

[1]: http://www.gnu.org/software/mailman/mailman-member/node21.html

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