On 9/13/23 5:42 AM, Ralf Hildebrandt via Mailman-Users wrote:
We have a mm2 installation. A user is regular memeber on two lists:
* A mail goes to both lists.
* That mail is distributed via both lists.
* The mail is delivered twice (to an exchange server), in two SMTP
sessions, to the same user adress. I get two positive delivery confirmations.
* since the message-id is identical, exchange is performing duplicate message
elimination
Since the mails are in fact NOT identical (different Subject -- each
lists adds their own [foo] and [bar] prefix), I'd very much prefer a
new message-id for the distributed mails.
I'm sure I can hack something up in Postfix, but is there an easy way (tm)?
Change the message-id as they pass through Mailman and you break
threading. Some people may get a direct copy of the message (instead of,
or in addition to the copy from the list). That will then have a
different Message-ID to what people who just gets the message from the
list, and thus the Reference: and In-Reply-To: headers won't match.
Note, same Message-ID NEVER meant "Identical" messages, it meant from
the same original message. Mail Transport Agents that just forward a
message with only "Administrative" changes, should not change the
Message-ID.
--
Richard Damon
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