Am 26.11.20 um 03:01 schrieb Mark Andrews:
The message that generated this thread had the following:

To: upendra.gan...@gmail.com
Cc: bind-users <bind-users@lists.isc.org>, BIND Users <bind-us...@isc.org>

Note the 2 different addresses for bind-users.  Both where delivered to 
lists.isc.org in a single SMTP
transaction as you noted (ESMTP id 026B967ED73) because the MTA worked out they 
both needed to be delivered to the same server.  They where then sent through 2 
different instances mailman.  One for bind-users@lists.isc.org
and one for bind-us...@isc.org and re-injected (ESMTP id B380C67F367 and ESMTP 
id E414B67F36E).

why is it that both exists when the system isn't capable of *basic* "suppress_duplicates = yes"?

that's also annoying in context of sieve / mua filters

On 26 Nov 2020, at 12:35, Paul Kosinski via bind-users 
<bind-users@lists.isc.org> wrote:

Yes indeed: I sent the last email (and this one) to bind-users and CC-ed to 
you. That explains why there are two different ESMTP IDs.

The question is, have you, like I have, received two copies of any emails (from 
lists.isc.org) where there *identical* ESMTP IDs in their associated sequences of 
"Received:" headers. This would indicate that the duplication was caused by an 
intermediate MTA. (The one I previously indicated was mx.pao1.isc.org, which is the one 
and only MX for lists.isc.org.)

On Tue, 24 Nov 2020 22:46:06 -0500
Jim Popovitch via bind-users <bind-users@lists.isc.org> wrote:

On Tue, 2020-11-24 at 22:22 -0500, Paul Kosinski wrote:
My reading of the headers (below) does *not* suggest "Reply All".

Rather, they show that mx.pao1.isc.org sent/forwarded the email once,
and it was received by lists.isc.org once with ESMTP ID 026B967ED73.
But then lists.isc.org resent/forwarded it more than once, as it was
received a few seconds later by lists.isc.org (again!) with two
*different* ESMTP IDs: B380C67F367 and E414B67F36E.

This suggests to me that lists.isc.org is being a bit too diligent in
delivering its email.


I just received 2 copies of your post, with 2 different ESMTP IDs...
because you sent it to 2 different recipients.  That same thing would
happen if you sent it to bind-users@lists.isc.org and
bind-users@lists.isc.org.

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