Two copies of recent posts

[Mark Andrews]

The message that generated this thread had the following:

To: upendra.gandhi at gmail.com 
Cc: bind-users <bind-users at lists.isc.org>, BIND Users <bind-users at 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 at lists.isc.org
and one for bind-users at isc.org and re-injected (ESMTP id B380C67F367 and ESMTP id E414B67F36E).

Mark

> On 26 Nov 2020, at 12:35, Paul Kosinski via bind-users <bind-users at 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.)
> 
> -Paul K.
> 
> 
> 
> 
> On Tue, 24 Nov 2020 22:46:06 -0500
> Jim Popovitch via bind-users <bind-users at 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 at lists.isc.org and 
>> bind-users at lists.isc.org.
>> 
>> -Jim P.
>> 
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742              INTERNET: marka at isc.org