Hi,

I have a strange thing happened and I could not figure it out what is going on. 
Here is what happened:
1. Syd V <s...@mydomain.com> sent an email to our mailing list 
sjv-geosupp...@mydomain.com
2. Trent replied to the list
3. All list members received Trent's reply, BUT with wrong FROM address. It 
appears Trent's reply is from Syd. ???
4. I talked to Trent and asked him to do another reply to list, and this time 
everything is correct. He can not re-produce this error.

I post the header section from Trent's reply as well as the maillog here.

I am using mailman 2.1.15 on a CentOS7+Postfix.

Could someone give me some hints on how this happened and how to fix it?

Thanks.

Gao

================
header:
----------------
Return-Path: <sjv-geosupport-boun...@mydomain.com>
X-Original-To: g...@mydomain.com
Delivered-To: g...@mydomain.com
Received: by zeta.mydomain.com (Postfix, from userid 5001)
        id D92DA2015FD6E; Tue, 20 Sep 2016 09:18:18 -0700 (PDT)
Received: from zeta.mydomain.com (localhost [IPv6:::1])
        by zeta.mydomain.com (Postfix) with ESMTP id E3B7120158EC5;
        Tue, 20 Sep 2016 09:18:11 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=mydomain.com;
        s=szeta; t=1474388291;
        bh=tiwZ4VEiU1RZzIFTSx2DZbnLAXPUQDkUd1sc9ss5YiM=;
        h=From:To:Date:Subject:List-Id:List-Unsubscribe:List-Archive:
         List-Post:List-Help:List-Subscribe:Reply-To;
        b=jq8Dilf8Kcjca3CTkC/LVSrii3G2RTO6z6TYQXPhWWqDlM1Q0DNS3WSco0TgV6PPY
         7p/AObLxO/cOyvDbtf9ejQ7XDTipWhCicV7Qq/7fi+7q2J9p/xPqIweTqci0gBeIQR
         sXE1AvP7V7e94W+FGQoYsBnQBV6jmHsGo4shrRp4=
X-Original-To: sjv-geosupp...@zeta.mydomain.com
Delivered-To: sjv-geosupp...@zeta.mydomain.com
Received: by zeta.mydomain.com (Postfix, from userid 5001)
 id EB63E20158EC6; Tue, 20 Sep 2016 09:18:04 -0700 (PDT)
Received: from [192.168.123.87] (vpn.mydomain.com [111.111.111.111])
 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))
 (No client certificate requested)
 by zeta.mydomain.com (Postfix) with ESMTPSA id 36FFF20158EC6
 for <sjv-geosupp...@mydomain.com>; Tue, 20 Sep 2016 09:18:02 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=mydomain.com;
 s=szeta; t=1474388282;
 bh=ABUiYP5lz8c1gfzYye+PUoTjcGicHkgvhh6PstHMBZ4=;
 h=From:Subject:Reply-To:To:Date;
 b=tHH79YeXgMzTwDugmsEGJ6yIIaTYOjjbse4jy1P99gW8AE7cvd8SEWqiC/xEcShZc
 RlvFvIrL3Bub8w7RfL+4k+JURE0YHRIhKlEx4LHo+TSic2tBEY06oXUrZuvQEMcn3T
 r9VpzkEcV5BWytqZgYvxRarJOv7Huh2vP8LuZBGE=
From: Syd V <s...@mydomain.com>
To: sjv-geosupp...@mydomain.com
Message-ID: <f403fa07-76de-98d9-6796-16570519b...@mydomain.com>
Date: Tue, 20 Sep 2016 09:17:56 -0700
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101
 Thunderbird/45.2.0
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="------------677E4034B35AA62A233129E2"
X-mydomain-MailScanner: Found to be clean, Found to be clean
X-mydomain-MailScanner-SpamCheck: not spam, SpamAssassin (not cached,
 score=-6.095, required 4, autolearn=not spam, ALL_TRUSTED -1.00,
 BAYES_00 -1.90, DKIM_SIGNED 0.10, DKIM_VALID -0.10,
 DKIM_VALID_AU -0.10, HTML_MESSAGE 0.00, RP_MATCHES_RCVD -3.10), not spam, 
SpamAssassin (not cached,
        score=-6.095, required 4, ALL_TRUSTED -1.00, BAYES_00 -1.90,
        DKIM_SIGNED 0.10, DKIM_VALID -0.10, DKIM_VALID_AU -0.10,
        HTML_MESSAGE 0.00, RP_MATCHES_RCVD -3.10)
X-Spam-Status: No, No
Subject: [Sjv-geosupport]  Update on timing and instrumentation files
X-BeenThere: sjv-geosupp...@mydomain.com
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: <sjv-geosupport.mydomain.com>
List-Unsubscribe: <http://zeta.mydomain.com/mailman/options/sjv-geosupport>,
 <mailto:sjv-geosupport-requ...@mydomain.com?subject=unsubscribe>
List-Archive: <http://zeta.mydomain.com/mailman/private/sjv-geosupport/>
List-Post: <mailto:sjv-geosupp...@mydomain.com>
List-Help: <mailto:sjv-geosupport-requ...@mydomain.com?subject=help>
List-Subscribe: <http://zeta.mydomain.com/mailman/listinfo/sjv-geosupport>,
 <mailto:sjv-geosupport-requ...@mydomain.com?subject=subscribe>
Reply-To: Syd Visser <s...@mydomain.com>
Errors-To: sjv-geosupport-boun...@mydomain.com
Sender: "Sjv-geosupport" <sjv-geosupport-boun...@mydomain.com>
X-mydomain-MailScanner-Information: Please contact the IT Administrator for 
more information
X-mydomain-MailScanner-ID: E3B7120158EC5.ABE01
X-mydomain-MailScanner-From: sjv-geosupport-boun...@mydomain.com


=============================
maillog:
-----------------------------
Sep 20 09:18:02 zeta postfix/smtpd[24662]: connect from 
vpn.mydomain.com[111.111.111.111]
Sep 20 09:18:02 zeta postfix/smtpd[24662]: Anonymous TLS connection established 
from vpn.mydomain.com[111.111.111.111]: TLSv1.2 with ciphe
r ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)
Sep 20 09:18:02 zeta postfix/smtpd[24662]: 36FFF20158EC6: 
client=vpn.mydomain.com[111.111.111.111], sasl_method=PLAIN, 
sasl_username=tr...@mydomain.com
Sep 20 09:18:02 zeta postfix/cleanup[24538]: 36FFF20158EC6: hold: header Received: from 
[192.168.123.87] (vpn.mydomain.com [111.111.111.111])??(using TLSv1.2 with cipher 
ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))??(No client certificate requested)??by zeta.mydomain. 
from vpn.mydomain.com[111.111.111.111]; from=<tr...@mydomain.com> 
to=<sjv-geosupp...@mydomain.com> proto=ESMTP helo=<[192.168.123.87]>
Sep 20 09:18:02 zeta postfix/cleanup[24538]: 36FFF20158EC6: 
message-id=<f403fa07-76de-98d9-6796-16570519b...@mydomain.com>
Sep 20 09:18:02 zeta opendkim[3099]: 36FFF20158EC6: DKIM-Signature field added 
(s=szeta, d=mydomain.com)
Sep 20 09:18:02 zeta postfix/smtpd[24662]: disconnect from 
vpn.mydomain.com[111.111.111.111]
Sep 20 09:18:02 zeta MailScanner[20657]: New Batch: Scanning 1 messages, 18122 
bytes
Sep 20 09:18:02 zeta MailScanner[20657]: Virus and Content Scanning: Starting
Sep 20 09:18:02 zeta MailScanner[20657]: Spam Checks: Starting
Sep 20 09:18:04 zeta MailScanner[20657]: Message 36FFF20158EC6.A07F8 from 
111.111.111.111 (tr...@mydomain.com) to mydomain.com is not spam, SpamAssassin 
(not cached, score=-6.095, required 4, autolearn=not spam, ALL_TRUSTED -1.00, 
BAYES_00 -1.90, DKIM_SIGNED 0.10, DKIM_VALID -0.10, DKIM_VALID_AU -0.10, 
HTML_MESSAGE 0.00, RP_MATCHES_RCVD -3.10)
Sep 20 09:18:04 zeta MailScanner[20657]: Requeue: 36FFF20158EC6.A07F8 to 
3603320158ECB
Sep 20 09:18:04 zeta postfix/qmgr[6820]: 3603320158ECB: 
from=<tr...@mydomain.com>, size=16818, nrcpt=1 (queue active)
Sep 20 09:18:04 zeta MailScanner[20657]: Uninfected: Delivered 1 messages
Sep 20 09:18:04 zeta MailScanner[20657]: Deleted 1 messages from 
processing-database
Sep 20 09:18:04 zeta MailScanner[20657]: Logging message 36FFF20158EC6.A07F8 to 
SQL
Sep 20 09:18:04 zeta MailScanner[22108]: 36FFF20158EC6.A07F8: Logged to 
MailWatch SQL
Sep 20 09:18:04 zeta postfix/pickup[21381]: EB63E20158EC6: uid=5001 
from=<tr...@mydomain.com>
Sep 20 09:18:04 zeta postfix/pipe[24825]: 3603320158ECB: 
to=<sjv-geosupp...@zeta.mydomain.com>, orig_to=<sjv-geosupp...@mydomain.com>, 
relay=autoresponder, delay=2.7, delays=2.7/0/0/0.02, dsn=2.0.0, status=sent (delivered via 
autoresponder service)
Sep 20 09:18:04 zeta postfix/qmgr[6820]: 3603320158ECB: removed
Sep 20 09:18:04 zeta postfix/cleanup[24407]: EB63E20158EC6: hold: header Received: by 
zeta.mydomain.com (Postfix, from userid 5001)??id EB63E20158EC6; Tue, 20 Sep 2016 09:18:04 
-0700 (PDT) from local; from=<tr...@mydomain.com> 
to=<sjv-geosupp...@zeta.mydomain.com>
Sep 20 09:18:04 zeta postfix/cleanup[24407]: EB63E20158EC6: 
message-id=<f403fa07-76de-98d9-6796-16570519b...@mydomain.com>
Sep 20 09:18:10 zeta MailScanner[22098]: New Batch: Scanning 1 messages, 18148 
bytes
Sep 20 09:18:10 zeta MailScanner[22098]: Requeue: EB63E20158EC6.A4FB8 to 
BE0D320158ECB
Sep 20 09:18:10 zeta MailScanner[22098]: Unscanned: Delivered 1 messages
Sep 20 09:18:10 zeta postfix/qmgr[6820]: BE0D320158ECB: 
from=<tr...@mydomain.com>, size=17844, nrcpt=1 (queue active)
Sep 20 09:18:10 zeta MailScanner[22098]: Spam Checks: Starting
Sep 20 09:18:10 zeta MailScanner[22098]: Deleted 1 messages from 
processing-database
Sep 20 09:18:10 zeta MailScanner[22098]: Logging message EB63E20158EC6.A4FB8 to 
SQL
Sep 20 09:18:10 zeta MailScanner[22108]: EB63E20158EC6.A4FB8: Logged to 
MailWatch SQL
Sep 20 09:18:10 zeta postfix/local[25085]: BE0D320158ECB: 
to=<sjv-geosupp...@zeta.mydomain.com>, relay=local, delay=5.5, 
delays=5.4/0.01/0/0.1, dsn=2.0.0, status=sent (delivered to command: 
/usr/lib/mailman/mail/mailman post sjv-geosupport)
Sep 20 09:18:10 zeta postfix/qmgr[6820]: BE0D320158ECB: removed
Sep 20 09:18:11 zeta postfix/smtpd[24800]: connect from localhost[::1]
Sep 20 09:18:11 zeta postfix/smtpd[24800]: E3B7120158EC5: client=localhost[::1]
Sep 20 09:18:11 zeta postfix/cleanup[24538]: E3B7120158EC5: hold: header Received: from 
zeta.mydomain.com (localhost [IPv6:::1])??by zeta.mydomain.com (Postfix) with ESMTP id 
E3B7120158EC5;??Tue, 20 Sep 2016 09:18:11 -0700 (PDT) from localhost[::1]; 
from=<sjv-geosupport-boun...@mydomain.com> to=<katie.d...@mydomain.com> proto=ESMTP 
helo=<zeta.mydomain.com>
Sep 20 09:18:11 zeta postfix/cleanup[24538]: E3B7120158EC5: 
message-id=<f403fa07-76de-98d9-6796-16570519b...@mydomain.com>
Sep 20 09:18:11 zeta opendkim[3099]: E3B7120158EC5: DKIM-Signature field added 
(s=szeta, d=mydomain.com)
Sep 20 09:18:12 zeta postfix/smtpd[24800]: disconnect from localhost[::1]
Sep 20 09:18:16 zeta MailScanner[22098]: Virus and Content Scanning: Starting
Sep 20 09:18:16 zeta MailScanner[22098]: Spam Checks: Starting
Sep 20 09:18:16 zeta MailScanner[22098]: Message E3B7120158EC5.ABE01 from ::1 
(sjv-geosupport-boun...@mydomain.com) ignored whitelist, had 33 recipients (>20)
Sep 20 09:18:18 zeta MailScanner[22098]: Message E3B7120158EC5.ABE01 from ::1 
(sjv-geosupport-boun...@mydomain.com) to mydomain.com is not spam, SpamAssassin 
(not cached, score=-6.095, required 4, ALL_TRUSTED -1.00, BAYES_00 -1.90, 
DKIM_SIGNED 0.10, DKIM_VALID -0.10, DKIM_VALID_AU -0.10, HTML_MESSAGE 0.00, 
RP_MATCHES_RCVD -3.10)
Sep 20 09:18:18 zeta MailScanner[22098]: Requeue: E3B7120158EC5.ABE01 to 
0233620158EC0
Sep 20 09:18:18 zeta MailScanner[22098]: Uninfected: Delivered 1 messages
Sep 20 09:18:18 zeta postfix/qmgr[6820]: 0233620158EC0: 
from=<sjv-geosupport-boun...@mydomain.com>, size=19224, nrcpt=33 (queue active)
Sep 20 09:18:18 zeta MailScanner[22098]: Deleted 1 messages from 
processing-database
.....


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