Ralf Hildebrandt via Mailman-Users writes:

 > I'm sure I can hack something up in Postfix, but is there an easy
 > way (tm)?

Get rid of Exchange. :-)

This is not something Mailman should implement in my opinion.  The
author decided to send a single message to multiple addresses.
Evidently that author considers it to be the same message regardless
of which list delivers it.  I also don't think it makes for a healthy
community based on the points below.  It may work fine in some special
cases, but it seems likely to cause a lot of confusion.

Now, as Richard Damon points out, whether two messages should have the
same Message-ID is not a matter of identical content, it's whether
users consider them "the same".  Since a mailing list is an
intermediary, that is, it removes a message from the Internet mail
system, processes it, and then reinjects it, the mailing list can
claim to be the originator of the distributed post in some sense
(though obviously not in the sense of copyright law!)  So if you want
to make this decision for all subscribers, you can do that.

However, here are some points to consider.
- Are the recipients who subscribe to both lists unanimous in their
  desire to duplicate messages in this way?  If not, are the
  individuals who want distinct messages "more important"?
- Unless you are very clear about this change, some recipients may
  think the authors are sending multiple copies, and ask them to
  desist.
- Anybody who uses reply-all will also have their posts duplicated in
  the same way.  This will create a weird proliferation of threads,
  which I doubt will display sanely in most mail clients.
- It will very likely cause more than usual redundant posts because
  even people who are subscribed to both will be missing most of the
  potentially relevant replies.

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