silently ignore duplicate inews via mailpost

Harald Dunkel harald.dunkel at
Fri Dec 18 08:35:51 UTC 2020

Hi Julien,

thanx for your patience. It happened again yesterday, so I am able to
send you the configuration and a sample.

There are 2 EMail aliases on our inews & sendmail server saying

CUSTOMER_BOSS: "|/usr/lib/news/bin/mailpost -c 15 -b /var/tmp -x To:CC example.projects.CUSTOMER_BOSS"
example.projects.CUSTOMER_BOSS: "|/usr/lib/news/bin/mailpost -c 15 -b /var/tmp -x To:CC example.projects.CUSTOMER_BOSS"

(We have >50 aliases following this scheme. They are generated from
the list of local newsgroups matching "example.projects.SOMETHING". The
"short" alias was introduced to make it easy for our colleagues to post
by EMail.)

AFAICT the EMail/News article was posted using thunderbird. The header
I received within the mailpost failure message was

From: anja at (Anja)
Newsgroups: example.projects.CUSTOMER_BOSS
To: "Alexander" <Alexander at>,
         Steffen <steffen at>,
	=?UTF-8?Q?Kalle_S=c3=b6chmann?= <Kalle.Soechmann at>
Cc: Bernd <bernhard at>,
         Anke <anke at>,
         Martin <martin at>
MIME-Version: 1.0
Content-Type: multipart/mixed;
Subject: BOSS // example - Protokoll zum Workshop
Message-ID: <35ad3dd8-c2bb-8f7b-2615-17e95aadf212 at>
References: <c43ce95d-9aa0-ea3f-03f0-3a3e1bbc1e3c at>
Date: Thu, 17 Dec 2020 17:06:56 +0100
X-Received: from [] ([])
	by (8.15.2/8.15.2/Debian-14~deb10u1) with ESMTP id 0BHG72hw1297524;
	Thu, 17 Dec 2020 17:07:02 +0100
X-Newsgroups: example.projects.CUSTOMER_BOSS
X-User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101
X-In-Reply-To: <c43ce95d-9aa0-ea3f-03f0-3a3e1bbc1e3c at>
X-Virus-Scanned: clamav-milter 0.102.4 at
X-Virus-Status: Clean

As you can see, Anja posted the article twice: Once per Newsgroup integration
in Thunderbird, and once via the "short" EMail alias. I cannot blame Anja here.
She just clicked on [reply to all].

Question was whether it would be possible to silently ignore the
duplicate article without sending a mailpost failure EMail?


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