On 10/27/2015 05:06 PM, Viktor Dukhovni wrote:
On Tue, Oct 27, 2015 at 08:45:20AM +0100, Marco Stoecker wrote:

Here is the log, where postfix got the original message (which was sent
to 5 mailing lists) and handed over to mailman (which is done 5 times
with different postfix ID's).

No, the logs show 5 incoming messages (from [::1]) each to the same
5 recipients.  Any bifurcation is upstream.  Perhaps a misconfigured
content_filter?

I'm just curious about the
message-id=<008b01d10ca4$eb5fd0b0$c21f7210$@de>, this is always the
same, but the postfix ID differ. Any glue?

The clue is that 5 messages arrived, so Postfix delivered all 5
messages.  I've "collated" the logs below.  You need to look at
the "Received" headers of one of the messages to determine how it
got to "[::1]".

...

I do need some assistance, as this is very new for me.
Thx in advance.
So this is the "Received" header of 5 out of 5 messages. I can't see where the duplication happend :-(

message1:
Received: from mout.kundenserver.de (mout.kundenserver.de [212.227.17.24])
        by metaxa.loswebos.de (Postfix) with ESMTPS id 623A33A8C005
        for <m...@mydomain.de>; Thu, 22 Oct 2015 10:45:05 +0200 (CEST)
Received: from wakis02.local ([92.211.6.209]) by mrelayeu.kundenserver.de (mreue104) with ESMTPA (Nemesis) id 0LbJZC-1aDlg63wBm-00kvH9; Thu, 22 Oct
 2015 10:45:05 +0200
Received: from wakis02.local (localhost [IPv6:::1])
        by wakis02.local (Postfix) with ESMTP id B25442678;
        Thu, 22 Oct 2015 10:44:55 +0200 (CEST)
X-Original-To: vorstand@localhost
Delivered-To: vorstand@localhost
Received: from wakis02.local (localhost [IPv6:::1])
 by wakis02.local (Postfix) with ESMTP id 98DC6269A;
 Thu, 22 Oct 2015 10:40:43 +0200 (CEST)
Received: from imap.1und1.de [212.227.15.188]
 by wakis02.local with IMAP (fetchmail-6.3.26)
 Thu, 22 Oct 2015 10:40:43 +0200 (CEST)
Received: from [212.227.15.41] ([212.227.15.41]) by mx.kundenserver.de
 (mxeue002) with ESMTPS (Nemesis) id 0M1foo-1aeGtV2fLW-00tjIT for
<mailmanser...@waldorfkindergarten-erlangen.de>; Thu, 22 Oct 2015 10:37:47
 +0200
Received: from mout.web.de ([212.227.15.3]) by mx.kundenserver.de (mxeue002)
 with ESMTPS (Nemesis) id 0MVE1V-1a1cd42azt-00YP1m for
<ak-lei...@waldorfkindergarten-erlangen.de>; Thu, 22 Oct 2015 10:37:47 +0200 Received: from Klamotten ([84.168.195.183]) by smtp.web.de (mrweb003) with ESMTPSA (Nemesis) id 0MTh7A-1Zy14E1g36-00QRsw; Thu, 22 Oct 2015 10:37:47
 +0200

message2:
Received: from mout.kundenserver.de (mout.kundenserver.de [212.227.126.187])
        by metaxa.loswebos.de (Postfix) with ESMTPS id F24F23962117
        for <m...@mydomain.de>; Thu, 22 Oct 2015 10:43:36 +0200 (CEST)
Received: from wakis02.local ([92.211.6.209]) by mrelayeu.kundenserver.de (mreue004) with ESMTPA (Nemesis) id 0LouWl-1aRIN61viN-00gqgL; Thu, 22 Oct
 2015 10:43:35 +0200
Received: from wakis02.local (localhost [IPv6:::1])
        by wakis02.local (Postfix) with ESMTP id EA2772652;
        Thu, 22 Oct 2015 10:43:25 +0200 (CEST)
X-Original-To: vorstand@localhost
Delivered-To: vorstand@localhost
Received: from wakis02.local (localhost [IPv6:::1])
 by wakis02.local (Postfix) with ESMTP id 8251C2697;
 Thu, 22 Oct 2015 10:40:32 +0200 (CEST)
Received: from imap.1und1.de [212.227.15.188]
 by wakis02.local with IMAP (fetchmail-6.3.26)
 Thu, 22 Oct 2015 10:40:32 +0200 (CEST)
Received: from [212.227.15.41] ([212.227.15.41]) by mx.kundenserver.de
 (mxeue002) with ESMTPS (Nemesis) id 0MfQUM-1a9cy92XG6-00OoOD for
<mailmanser...@waldorfkindergarten-erlangen.de>; Thu, 22 Oct 2015 10:37:47
 +0200
Received: from mout.web.de ([212.227.15.3]) by mx.kundenserver.de (mxeue002)
 with ESMTPS (Nemesis) id 0M4zk6-1ajnCX2Rpe-00zFbN for
<vorst...@waldorfkindergarten-erlangen.de>; Thu, 22 Oct 2015 10:37:47 +0200 Received: from Klamotten ([84.168.195.183]) by smtp.web.de (mrweb003) with ESMTPSA (Nemesis) id 0MTh7A-1Zy14E1g36-00QRsw; Thu, 22 Oct 2015 10:37:47
 +0200

message3:
Received: from mout.kundenserver.de (mout.kundenserver.de [212.227.126.187])
        by metaxa.loswebos.de (Postfix) with ESMTPS id A70E73A8C005
        for <m...@mydomain.de>; Thu, 22 Oct 2015 10:43:20 +0200 (CEST)
Received: from wakis02.local ([92.211.6.209]) by mrelayeu.kundenserver.de (mreue005) with ESMTPA (Nemesis) id 0Ll22r-1aPcc22d41-00ao9V; Thu, 22 Oct
 2015 10:43:19 +0200
Received: from wakis02.local (localhost [IPv6:::1])
        by wakis02.local (Postfix) with ESMTP id B25AD2678;
        Thu, 22 Oct 2015 10:43:09 +0200 (CEST)
X-Original-To: vorstand@localhost
Delivered-To: vorstand@localhost
Received: from wakis02.local (localhost [IPv6:::1])
 by wakis02.local (Postfix) with ESMTP id 8010E3A;
 Thu, 22 Oct 2015 10:40:21 +0200 (CEST)
Received: from imap.1und1.de [212.227.15.188]
 by wakis02.local with IMAP (fetchmail-6.3.26)
 Thu, 22 Oct 2015 10:40:21 +0200 (CEST)
Received: from [212.227.15.41] ([212.227.15.41]) by mx.kundenserver.de
 (mxeue002) with ESMTPS (Nemesis) id 0M2Uth-1ahI6Q2nfZ-00sLaU for
<mailmanser...@waldorfkindergarten-erlangen.de>; Thu, 22 Oct 2015 10:37:47
 +0200
Received: from mout.web.de ([212.227.15.3]) by mx.kundenserver.de (mxeue002)
 with ESMTPS (Nemesis) id 0MIWPn-1ZovKO2jl9-004F6W for
<kolleg...@waldorfkindergarten-erlangen.de>; Thu, 22 Oct 2015 10:37:47 +0200 Received: from Klamotten ([84.168.195.183]) by smtp.web.de (mrweb003) with ESMTPSA (Nemesis) id 0MTh7A-1Zy14E1g36-00QRsw; Thu, 22 Oct 2015 10:37:47
 +0200

message4:
Received: from mout.kundenserver.de (mout.kundenserver.de [212.227.126.130])
        by metaxa.loswebos.de (Postfix) with ESMTPS id E0A7F3962117
        for <m...@mydomain.de>; Thu, 22 Oct 2015 10:42:00 +0200 (CEST)
Received: from wakis02.local ([92.211.6.209]) by mrelayeu.kundenserver.de (mreue002) with ESMTPA (Nemesis) id 0MLWss-1Zpjft3hlC-000YfU; Thu, 22 Oct
 2015 10:41:59 +0200
Received: from wakis02.local (localhost [IPv6:::1])
        by wakis02.local (Postfix) with ESMTP id AACAA2652;
        Thu, 22 Oct 2015 10:41:50 +0200 (CEST)
X-Original-To: vorstand@localhost
Delivered-To: vorstand@localhost
Received: from wakis02.local (localhost [IPv6:::1])
 by wakis02.local (Postfix) with ESMTP id ADDE72652;
 Thu, 22 Oct 2015 10:40:10 +0200 (CEST)
Received: from imap.1und1.de [212.227.15.188]
 by wakis02.local with IMAP (fetchmail-6.3.26)
 Thu, 22 Oct 2015 10:40:10 +0200 (CEST)
Received: from [212.227.15.41] ([212.227.15.41]) by mx.kundenserver.de
 (mxeue002) with ESMTPS (Nemesis) id 0LdwgG-1aIjuJ31O0-00pvud for
<mailmanser...@waldorfkindergarten-erlangen.de>; Thu, 22 Oct 2015 10:37:47
 +0200
Received: from mout.web.de ([212.227.15.3]) by mx.kundenserver.de (mxeue002)
 with ESMTPS (Nemesis) id 0M1Oy9-1adzmM2xGD-00tS34 for
<gruppensprec...@waldorfkindergarten-erlangen.de>; Thu, 22 Oct 2015 10:37:47
 +0200
Received: from Klamotten ([84.168.195.183]) by smtp.web.de (mrweb003) with ESMTPSA (Nemesis) id 0MTh7A-1Zy14E1g36-00QRsw; Thu, 22 Oct 2015 10:37:47
 +0200

message5:
Received: from mout.kundenserver.de (mout.kundenserver.de [212.227.17.24])
        by metaxa.loswebos.de (Postfix) with ESMTPS id BE19B3A8C005
        for <m...@mydomain.de>; Thu, 22 Oct 2015 10:41:33 +0200 (CEST)
Received: from wakis02.local ([92.211.6.209]) by mrelayeu.kundenserver.de (mreue101) with ESMTPA (Nemesis) id 0MV4mL-1a1cZQ2mib-00YNtS; Thu, 22 Oct
 2015 10:41:33 +0200
Received: from wakis02.local (localhost [IPv6:::1])
        by wakis02.local (Postfix) with ESMTP id 1E8392678;
        Thu, 22 Oct 2015 10:41:24 +0200 (CEST)
X-Original-To: vorstand@localhost
Delivered-To: vorstand@localhost
Received: from wakis02.local (localhost [IPv6:::1])
 by wakis02.local (Postfix) with ESMTP id BF9AD1C94;
 Thu, 22 Oct 2015 10:40:05 +0200 (CEST)
Received: from imap.1und1.de [212.227.15.188]
 by wakis02.local with IMAP (fetchmail-6.3.26)
 Thu, 22 Oct 2015 10:40:05 +0200 (CEST)
Received: from [212.227.15.41] ([212.227.15.41]) by mx.kundenserver.de
 (mxeue002) with ESMTPS (Nemesis) id 0MPww6-1Zu9SD394E-0054aD for
<mailmanser...@waldorfkindergarten-erlangen.de>; Thu, 22 Oct 2015 10:37:47
 +0200
Received: from mout.web.de ([212.227.15.3]) by mx.kundenserver.de (mxeue002)
 with ESMTPS (Nemesis) id 0MKz7Q-1ZpBNb35bE-0006Vb for
<beis...@waldorfkindergarten-erlangen.de>; Thu, 22 Oct 2015 10:37:47 +0200 Received: from Klamotten ([84.168.195.183]) by smtp.web.de (mrweb003) with ESMTPSA (Nemesis) id 0MTh7A-1Zy14E1g36-00QRsw; Thu, 22 Oct 2015 10:37:47
 +0200

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