This list generates a forward loop ...

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This list generates a forward loop ...

Walter H.
Hello,

On every post I get an error mail back:

<BEGIN>
Subject:   Undelivered Mail Returned to Sender
From:   "Mail Delivery System" <[hidden email]>
Date:   Tue, July 18, 2017 15:36
To:          ...
Priority:   Normal

This is the mail system at host lists.squid-cache.org.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<[hidden email]> (expanded from
    <[hidden email]>): mail forwarding loop for
    [hidden email]
<END>

Why?

Thanks,
Walter

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http://lists.squid-cache.org/listinfo/squid-users
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Re: This list generates a forward loop ...

Antony Stone
On Tuesday 18 July 2017 at 14:42:21, Walter H. wrote:

> Hello,
>
> On every post I get an error mail back

What's the difference between the posts which generate an error, and this one
which got through?

Are you sending all from the same address, through the same mail server?


Antony.

--
"Once you have a panic, things tend to become rather undefined."

 - murble

                                                   Please reply to the list;
                                                         please *don't* CC me.
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Re: This list generates a forward loop ...

Amos Jeffries
Administrator
In reply to this post by Walter H.
On 19/07/17 01:42, Walter H. wrote:
>
> <[hidden email]> (expanded from
>      <[hidden email]>): mail forwarding loop for
>      [hidden email]
> <END>
>
> Why?


You sent a mail to the address squid-users@squid-cache.*

The mailing list address is squid-users@lists.*


Amos
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Re: This list generates a forward loop ...

Matus UHLAR - fantomas
>On 19/07/17 01:42, Walter H. wrote:
>><[hidden email]> (expanded from
>>     <[hidden email]>): mail forwarding loop for
>>     [hidden email]

On 19.07.17 18:54, Amos Jeffries wrote:
>You sent a mail to the address squid-users@squid-cache.*
>
>The mailing list address is squid-users@lists.*

however this should not cause troubles of that kind.
Only if someone/something resends messages to To/Cc addresses.

look onto headers of the mail attached (if there's any) in the error message
could explain it.

--
Matus UHLAR - fantomas, [hidden email] ; http://www.fantomas.sk/
Warning: I wish NOT to receive e-mail advertising to this address.
Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
REALITY.SYS corrupted. Press any key to reboot Universe.
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Re: This list generates a forward loop ...

Walter H.
In reply to this post by Amos Jeffries
On 19.07.2017 08:54, Amos Jeffries wrote:

> On 19/07/17 01:42, Walter H. wrote:
>>
>> <[hidden email]> (expanded from
>> <[hidden email]>): mail forwarding loop for
>>      [hidden email]
>> <END>
>>
>> Why?
>
>
> You sent a mail to the address squid-users@squid-cache.*
>
> The mailing list address is squid-users@lists.*
>
No, see the log of my outgoing Mail server ...

<BEGIN /var/log/maillog>
Jul 18 14:29:05 smtpout postfix/smtp[7177]: 537DB66:
to=<[hidden email]>,
relay=smtp.world4you.com[81.19.149.200]:587, delay=0.68,
delays=0.02/0.1/0.21/0.36, dsn=2.0.0, status=sent (250 OK
id=1dXRce-0008Hp-LA)
Jul 18 15:37:04 smtpout postfix/smtp[8973]: 85ED0FA:
to=<[hidden email]>,
relay=smtp.world4you.com[81.19.149.200]:587, delay=0.5,
delays=0.01/0.03/0.33/0.13, dsn=2.0.0, status=sent (250 OK
id=1dXSgR-0007G1-UM)
Jul 18 15:42:22 smtpout postfix/smtp[9121]: AB859FA:
to=<[hidden email]>,
relay=smtp.world4you.com[81.19.149.200]:587, delay=0.47,
delays=0.01/0.04/0.33/0.09, dsn=2.0.0, status=sent (250 OK
id=1dXSla-00008Z-2r)
Jul 19 11:16:30 smtpout postfix/smtp[8824]: 51E02FA:
to=<[hidden email]>,
relay=smtp.world4you.com[81.19.149.200]:587, delay=0.54,
delays=0.02/0.07/0.23/0.22, dsn=2.0.0, status=sent (250 OK
id=1dXl5q-0002Io-Nu)
Jul 19 11:40:36 smtpout postfix/smtp[9466]: 534C9FA:
to=<[hidden email]>,
relay=smtp.world4you.com[81.19.149.200]:587, delay=0.35,
delays=0.02/0.03/0.2/0.1, dsn=2.0.0, status=sent (250 OK
id=1dXlTA-0006eh-JU)
Jul 19 19:30:41 smtpout postfix/smtp[21871]: 96E3FFA:
to=<[hidden email]>,
relay=smtp.world4you.com[81.19.149.200]:587, delay=0.51,
delays=0.02/0.07/0.27/0.15, dsn=2.0.0, status=sent (250 OK
id=1dXso4-00027Q-Ux)
Jul 19 20:37:54 smtpout postfix/smtp[23635]: DF09966:
to=<[hidden email]>,
relay=smtp.world4you.com[81.19.149.200]:587, delay=0.45,
delays=0.03/0.07/0.23/0.12, dsn=2.0.0, status=sent (250 OK
id=1dXtr8-0007MA-7f)
<END /var/log/maillog>

the log entry of this mail is of course not included ...

I got back 5 error mails last night ...


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Re: This list generates a forward loop ...

Walter H.
On 20.07.2017 05:35, Walter H. wrote:

> On 19.07.2017 08:54, Amos Jeffries wrote:
>> On 19/07/17 01:42, Walter H. wrote:
>>>
>>> <[hidden email]> (expanded from
>>> <[hidden email]>): mail forwarding loop for
>>>      [hidden email]
>>> <END>
>>>
>>> Why?
>>
>>
>> You sent a mail to the address squid-users@squid-cache.*
>>
>> The mailing list address is squid-users@lists.*
>>
> No, see the log of my outgoing Mail server ...
>
> <BEGIN /var/log/maillog>
> Jul 18 14:29:05 smtpout postfix/smtp[7177]: 537DB66:
> to=<[hidden email]>,
> relay=smtp.world4you.com[81.19.149.200]:587, delay=0.68,
> delays=0.02/0.1/0.21/0.36, dsn=2.0.0, status=sent (250 OK
> id=1dXRce-0008Hp-LA)
> Jul 18 15:37:04 smtpout postfix/smtp[8973]: 85ED0FA:
> to=<[hidden email]>,
> relay=smtp.world4you.com[81.19.149.200]:587, delay=0.5,
> delays=0.01/0.03/0.33/0.13, dsn=2.0.0, status=sent (250 OK
> id=1dXSgR-0007G1-UM)
> Jul 18 15:42:22 smtpout postfix/smtp[9121]: AB859FA:
> to=<[hidden email]>,
> relay=smtp.world4you.com[81.19.149.200]:587, delay=0.47,
> delays=0.01/0.04/0.33/0.09, dsn=2.0.0, status=sent (250 OK
> id=1dXSla-00008Z-2r)
> Jul 19 11:16:30 smtpout postfix/smtp[8824]: 51E02FA:
> to=<[hidden email]>,
> relay=smtp.world4you.com[81.19.149.200]:587, delay=0.54,
> delays=0.02/0.07/0.23/0.22, dsn=2.0.0, status=sent (250 OK
> id=1dXl5q-0002Io-Nu)
> Jul 19 11:40:36 smtpout postfix/smtp[9466]: 534C9FA:
> to=<[hidden email]>,
> relay=smtp.world4you.com[81.19.149.200]:587, delay=0.35,
> delays=0.02/0.03/0.2/0.1, dsn=2.0.0, status=sent (250 OK
> id=1dXlTA-0006eh-JU)
> Jul 19 19:30:41 smtpout postfix/smtp[21871]: 96E3FFA:
> to=<[hidden email]>,
> relay=smtp.world4you.com[81.19.149.200]:587, delay=0.51,
> delays=0.02/0.07/0.27/0.15, dsn=2.0.0, status=sent (250 OK
> id=1dXso4-00027Q-Ux)
> Jul 19 20:37:54 smtpout postfix/smtp[23635]: DF09966:
> to=<[hidden email]>,
> relay=smtp.world4you.com[81.19.149.200]:587, delay=0.45,
> delays=0.03/0.07/0.23/0.12, dsn=2.0.0, status=sent (250 OK
> id=1dXtr8-0007MA-7f)
> <END /var/log/maillog>
>
> the log entry of this mail is of course not included ...
>
> I got back 5 error mails last night ...
here is the complete error mail, that was replied to this last mail ...

<BEGIN>Return-Path: <>
Received: from storage.mail ([unix socket])
      by storage.mail (Cyrus v2.3.16-Fedora-RPM-2.3.16-15.el6) with LMTPA;
      Thu, 20 Jul 2017 05:47:11 +0200
X-Sieve: CMU Sieve 2.3
Received: from filter.mail by storage.mail (Postfix) with ESMTP id
E379F60034
Received: by filter.mail (Postfix) id D82723CA4
Delivered-To: [hidden email]
Received: from filter.mail [local] by filter.mail (Postfix) with ESMTP
id B23E3451
Received: by filter.mail (Postfix, userid 500) id 9BF3A3CA8
X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on filter.mail
X-Spam-Status: No, score=0.0 required=4.0 tests=none autolearn=ham
     version=3.3.1
Received: from filter.mail by filter.mail (Postfix) with ESMTP id DA0AF451
Envelope-to: [hidden email]
Delivery-date: Thu, 20 Jul 2017 05:44:37 +0200
Received: from [w4y-pop-server] by filter.mail with POP3 (fetchmail-6.3.17)
Received: from [81.19.149.115] (helo=mx05lb.world4you.com)
     by mail12.world4you.com with esmtps
(TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256)
     (Exim 4.89)
     id 1dY2OD-0003V6-LA
     for [hidden email]; Thu, 20 Jul 2017 05:44:37 +0200
Received: from [104.130.201.120] (helo=lists.squid-cache.org)
     by mx05lb.world4you.com with esmtp (Exim 4.84_2)
     id 1dY2OB-0004mf-Ud
     for [hidden email]; Thu, 20 Jul 2017 05:44:37 +0200
Received: by lists.squid-cache.org (Postfix)
     id C409FE23A1; Thu, 20 Jul 2017 03:44:49 +0000 (UTC)
Date: Thu, 20 Jul 2017 03:44:49 +0000 (UTC)
From: [hidden email] (Mail Delivery System)
To: [hidden email]
Auto-Submitted: auto-replied
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
     boundary="15AD7E1196.1500522289/lists.squid-cache.org"
Message-Id: <[hidden email]>
X-SA-Exim-Connect-IP: 104.130.201.120
X-SA-Exim-Mail-From:
Subject: Undelivered Mail Returned to Sender
X-SA-Exim-Version: 4.2.1 (built Thu, 31 Mar 2016 16:22:20 +0200)
X-SA-Exim-Scanned: Yes (on mx05lb.world4you.com)
X-AV-Scanned: ClamAV using ClamSMTP (filter.mail)

This is a MIME-encapsulated message.

--15AD7E1196.1500522289/lists.squid-cache.org
Content-Description: Notification
Content-Type: text/plain; charset=us-ascii

This is the mail system at host lists.squid-cache.org.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                    The mail system

<[hidden email]> (expanded from
<[hidden email]>): mail forwarding loop for
     [hidden email]

--15AD7E1196.1500522289/lists.squid-cache.org
Content-Description: Delivery report
Content-Type: message/delivery-status

Reporting-MTA: dns; lists.squid-cache.org
X-Postfix-Queue-ID: 15AD7E1196
X-Postfix-Sender: rfc822; [hidden email]
Arrival-Date: Thu, 20 Jul 2017 03:44:49 +0000 (UTC)

Final-Recipient: rfc822; [hidden email]
Original-Recipient: rfc822;[hidden email]
Action: failed
Status: 5.4.6
Diagnostic-Code: X-Postfix; mail forwarding loop for
     [hidden email]

--15AD7E1196.1500522289/lists.squid-cache.org
Content-Description: Undelivered Message
Content-Type: message/rfc822

Return-Path: <[hidden email]>
Received: from ScrolloutF1.linguitronics.com
(203-74-122-103.HINET-IP.hinet.net [203.74.122.103])
     by lists.squid-cache.org (Postfix) with ESMTPS id 15AD7E1196
     for <[hidden email]>; Thu, 20 Jul 2017 03:44:49
+0000 (UTC)
Authentication-Results: lists.squid-cache.org; dkim=fail
     reason="verification failed; unprotected key"
     header.d=mathemainzel.info header.i=@mathemainzel.info
     header.b=Z+/SVz0j; dkim-adsp=discard (unprotected policy);
     dkim-atps=neutral
Received: by ScrolloutF1.linguitronics.com (Postfix, from userid 0)
     id 3xCfsX5v6DzHpF4; Thu, 20 Jul 2017 11:44:32 +0800 (CST)
Delivered-To: unknown
Received: from 192.168.1.204 (192.168.1.204:143) by
   mailgateway.linguitronics.com with IMAP4; 20 Jul 2017 03:44:32 -0000
X-Original-To: [hidden email]
Delivered-To: [hidden email]
Received: from ScrolloutF1.linguitronics.com (unknown [192.168.1.205])
     by tw.linguitronics.com (Postfix) with ESMTP id 5A3E64023A
     for <[hidden email]>; Thu, 20 Jul 2017 11:35:56 +0800 (CST)
Authentication-Results: tw.linguitronics.com;
     dkim=fail reason="signature verification failed" (1024-bit key)
header.d=mathemainzel.info header.i=@mathemainzel.info header.b="Z+/SVz0j"
Received: from localhost (localhost [127.0.0.1])
     by ScrolloutF1.linguitronics.com (Postfix) with ESMTP id
3xCfgc5PKRzHr9d
     for <[hidden email]>; Thu, 20 Jul 2017 11:35:56 +0800 (CST)
X-Envelope-To: <[hidden email]>
X-Envelope-To-Blocked: <[hidden email]>
X-Quarantine-ID: <uAebWOExfOQd>
X-Spam-Score: 98.401
X-Spam-Status: No, score=-100.0 required=5.0 tests=SPF_PASS,T_DKIM_INVALID,
     UNPARSEABLE_RELAY,USER_IN_ALL_SPAM_TO autolearn=unavailable
     autolearn_force=no version=3.4.0
Authentication-Results: scrolloutf1.linguitronics.com (amavisd-new);
     dkim=fail (1024-bit key) reason="fail (message has been altered)"
     header.d=mathemainzel.info
Received: from ScrolloutF1.linguitronics.com ([127.0.0.1])
     by localhost (scrolloutf1.linguitronics.com [127.0.0.1])
(amavisd-new, port 10024)
     with LMTP id uAebWOExfOQd for <[hidden email]>;
     Thu, 20 Jul 2017 11:35:55 +0800 (CST)
Received-SPF: Pass (sender SPF authorized) identity=mailfrom;
client-ip=104.130.201.120; helo=lists.squid-cache.org;
envelope-from=[hidden email];
receiver=[hidden email]
Received: from lists.squid-cache.org (lists.squid-cache.org
[104.130.201.120])
     by ScrolloutF1.linguitronics.com (Postfix) with ESMTP id
3xCfgP4p5LzHr9b
     for <[hidden email]>; Thu, 20 Jul 2017 11:35:39 +0800 (CST)
Received: from master.squid-cache.org (ip6-localhost [127.0.0.1])
     by lists.squid-cache.org (Postfix) with ESMTP id BA427E239B;
     Thu, 20 Jul 2017 03:35:47 +0000 (UTC)
X-Original-To: [hidden email]
Delivered-To: [hidden email]
Received: from mx02lb.world4you.com (mx02lb.world4you.com [81.19.149.112])
  by lists.squid-cache.org (Postfix) with ESMTPS id 2705DE1193
  for <[hidden email]>; Thu, 20 Jul 2017 03:35:45
+0000 (UTC)
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed;
  d=mathemainzel.info; s=dkim11;
  h=Content-Type:In-Reply-To:References:Subject:To:MIME-Version:From:Date:Message-ID;
  bh=I9buaZEqIEKxwYTujfGAfgA9MLZUQZwd6uzO8hXcwVY=;
  b=Z+/SVz0jPiFGlzrXhnjW/qoyw+ekMYxPz1xbxz2Tz13sMoNRKH3xNUudSVT4ImRnnkveGEPvZ0tMiwJNAZNOfH2wFFAZaK0wbx6B9Ubu7QYrLJm6Y/lwgk24wkiz6PpB5VgRVxL5/GH5QVck0o6tf3VygCpRJFvmtw11fbbphpQ=;
Received: from [90.146.55.206] (helo=home.mail)
  by mx02lb.world4you.com with esmtpsa
(TLSv1.2:DHE-RSA-AES256-GCM-SHA384:256)
  (Exim 4.84_2) (envelope-from <[hidden email]>)
  id 1dY2FN-0002r0-5R
  for [hidden email]; Thu, 20 Jul 2017 05:35:29 +0200
Message-ID: <[hidden email]>
Date: Thu, 20 Jul 2017 05:35:28 +0200
From: "Walter H." <[hidden email]>
Organization: Home
User-Agent: Mozilla/5.0 (UNIX; U; Cray X-MP/48; en-US;
  rv:2.70) Gecko/20110929 Communicator/7.20
MIME-Version: 1.0
To: [hidden email]
References: <[hidden email]>
<[hidden email]>
In-Reply-To: <[hidden email]>
X-SA-Do-Not-Run: Yes
X-AV-Do-Run: Yes
X-SA-Exim-Connect-IP: 90.146.55.206
X-SA-Exim-Mail-From: [hidden email]
X-SA-Exim-Scanned: No (on mx02lb.world4you.com);
  SAEximRunCond expanded to false
X-Spam-Status: No, score=-100.0 required=5.0 tests=T_DKIM_INVALID,
  UNPARSEABLE_RELAY,USER_IN_ALL_SPAM_TO autolearn=unavailable
  autolearn_force=no version=3.4.0
X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on
     master.squid-cache.org
Subject: Re: [squid-users] This list generates a forward loop ...
X-BeenThere: [hidden email]
X-Mailman-Version: 2.1.16
Precedence: list
List-Id: "General discussion relating to Squid. The membership of this
list is
  thousands of Squid users from around the world"
<squid-users.lists.squid-cache.org>
List-Unsubscribe: <http://lists.squid-cache.org/options/squid-users>,
<mailto:[hidden email]?subject=unsubscribe>
List-Archive: <http://lists.squid-cache.org/pipermail/squid-users/>
List-Post: <mailto:[hidden email]>
List-Help: <mailto:[hidden email]?subject=help>
List-Subscribe: <http://lists.squid-cache.org/listinfo/squid-users>,
<mailto:[hidden email]?subject=subscribe>
Content-Type: multipart/mixed;
boundary="===============7862228297507396546=="
Errors-To: [hidden email]
Sender: "squid-users" <[hidden email]>
X-getmail-retrieved-from-mailbox: GOOD
X-Virus-Scanned: clamav-milter 0.99.2 at master.squid-cache.org
X-Virus-Status: Clean

This is a cryptographically signed message in MIME format.

--===============7862228297507396546==
Content-Type: multipart/signed; protocol="application/pkcs7-signature";
micalg=sha1; boundary="------------ms000506090802020601030308"

This is a cryptographically signed message in MIME format.

--------------ms000506090802020601030308
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: quoted-printable

On 19.07.2017 08:54, Amos Jeffries wrote:
 > On 19/07/17 01:42, Walter H. wrote:
 >>
 >> <[hidden email]> (expanded from
 >> <[hidden email]>): mail forwarding loop for
 >>      [hidden email]
 >> <END>
 >>
 >> Why?
 >
 >
 > You sent a mail to the address squid-users@squid-cache.*
 >
 > The mailing list address is squid-users@lists.*
 >
No, see the log of my outgoing Mail server ...


<BEGIN /var/log/maillog>
Jul 18 14:29:05 smtpout postfix/smtp[7177]: 537DB66:=20
to=3D<[hidden email]>,=20
relay=3Dsmtp.world4you.com[81.19.149.200]:587, delay=3D0.68,=20
delays=3D0.02/0.1/0.21/0.36, dsn=3D2.0.0, status=3Dsent (250 OK=20
id=3D1dXRce-0008Hp-LA)
Jul 18 15:37:04 smtpout postfix/smtp[8973]: 85ED0FA:=20
to=3D<[hidden email]>,=20
relay=3Dsmtp.world4you.com[81.19.149.200]:587, delay=3D0.5,=20
delays=3D0.01/0.03/0.33/0.13, dsn=3D2.0.0, status=3Dsent (250 OK=20
id=3D1dXSgR-0007G1-UM)
Jul 18 15:42:22 smtpout postfix/smtp[9121]: AB859FA:=20
to=3D<[hidden email]>,=20
relay=3Dsmtp.world4you.com[81.19.149.200]:587, delay=3D0.47,=20
delays=3D0.01/0.04/0.33/0.09, dsn=3D2.0.0, status=3Dsent (250 OK=20
id=3D1dXSla-00008Z-2r)
Jul 19 11:16:30 smtpout postfix/smtp[8824]: 51E02FA:=20
to=3D<[hidden email]>,=20
relay=3Dsmtp.world4you.com[81.19.149.200]:587, delay=3D0.54,=20
delays=3D0.02/0.07/0.23/0.22, dsn=3D2.0.0, status=3Dsent (250 OK=20
id=3D1dXl5q-0002Io-Nu)
Jul 19 11:40:36 smtpout postfix/smtp[9466]: 534C9FA:=20
to=3D<[hidden email]>,=20
relay=3Dsmtp.world4you.com[81.19.149.200]:587, delay=3D0.35,=20
delays=3D0.02/0.03/0.2/0.1, dsn=3D2.0.0, status=3Dsent (250 OK=20
id=3D1dXlTA-0006eh-JU)
Jul 19 19:30:41 smtpout postfix/smtp[21871]: 96E3FFA:=20
to=3D<[hidden email]>,=20
relay=3Dsmtp.world4you.com[81.19.149.200]:587, delay=3D0.51,=20
delays=3D0.02/0.07/0.27/0.15, dsn=3D2.0.0, status=3Dsent (250 OK=20
id=3D1dXso4-00027Q-Ux)
Jul 19 20:37:54 smtpout postfix/smtp[23635]: DF09966:=20
to=3D<[hidden email]>,=20
relay=3Dsmtp.world4you.com[81.19.149.200]:587, delay=3D0.45,=20
delays=3D0.03/0.07/0.23/0.12, dsn=3D2.0.0, status=3Dsent (250 OK=20
id=3D1dXtr8-0007MA-7f)
<END /var/log/maillog>

the log entry of this mail is of course not included ...

I got back 5 error mails last night ...


--------------ms000506090802020601030308
Content-Type: application/pkcs7-signature; name="smime.p7s"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="smime.p7s"
Content-Description: S/MIME Cryptographic Signature

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--------------ms000506090802020601030308--

--===============7862228297507396546==
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: base64
Content-Disposition: inline

X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18Kc3F1aWQtdXNl
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--===============7862228297507396546==--

--15AD7E1196.1500522289/lists.squid-cache.org--
<END>


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Re: This list generates a forward loop ...

Amos Jeffries
Administrator

Your DKIM signature covers the Subject and To headers. Any normal
mailing list will modify those, so your server cannot do that on list
postings. Content-Type is also changed sometimes by our listserver due
to the list policy on binary attachments, I dont know whether that is a
common practice too but I suspect it might be. The others should be fine
AFAIK.


 > DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed;
 >   d=mathemainzel.info; s=dkim11;
 >
h=Content-Type:In-Reply-To:References:Subject:To:MIME-Version:From:Date:Message-ID;
 >   bh=I9buaZEqIEKxwYTujfGAfgA9MLZUQZwd6uzO8hXcwVY=;
 >
b=Z+/SVz0jPiFGlzrXhnjW/qoyw+ekMYxPz1xbxz2Tz13sMoNRKH3xNUudSVT4ImRnnkveGEPvZ0tMiwJNAZNOfH2wFFAZaK0wbx6B9Ubu7QYrLJm6Y/lwgk24wkiz6PpB5VgRVxL5/GH5QVck0o6tf3VygCpRJFvmtw11fbbphpQ=;



On a side note:
  What I see in these headers is a fight going on between your
mailserver sending crypto assertions and another list members server
actually verifying them - which of course fail because Subject/To get
changed by the list server, and the PGP signature is currently being
stripped.

The other members mailserver does something unusually nasty - it simply
loops the message back at the list instead of bouncing with a proper
error to you. And since your address is still the envelope sender our
server rejects with that loop error bouncing back at you.

[yes I wish our sysadmin could stop that bouncing, but the tools seem to
be limited].

Amos
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Re: This list generates a forward loop ...

Matus UHLAR - fantomas
On 20.07.17 17:16, Amos Jeffries wrote:
>Your DKIM signature covers the Subject and To headers. Any normal
>mailing list will modify those,

I disagree - IMHO sane listservers don't modify those headers.

> so your server cannot do that on list
>postings. Content-Type is also changed sometimes by our listserver
>due to the list policy on binary attachments, I dont know whether
>that is a common practice too but I suspect it might be. The others
>should be fine AFAIK.

This is a better example. However, mailserver supporting DKIM should strip
the DKIM header if it's going to modify anything signed.
Other solution is to refuse message (when the signer domain SKIM policy is
signall).

>The other members mailserver does something unusually nasty - it
>simply loops the message back at the list instead of bouncing with a
>proper error to you. And since your address is still the envelope
>sender our server rejects with that loop error bouncing back at you.

which is exactly what I have guessed :-)
And this is why header of original attached message were useful:

Received: from ScrolloutF1.linguitronics.com (203-74-122-103.HINET-IP.hinet.net [203.74.122.103])
     by lists.squid-cache.org (Postfix) with ESMTPS id 15AD7E1196
     for <[hidden email]>; Thu, 20 Jul 2017 03:44:49 +0000 (UTC)
Received: by ScrolloutF1.linguitronics.com (Postfix, from userid 0)
     id 3xCfsX5v6DzHpF4; Thu, 20 Jul 2017 11:44:32 +0800 (CST)
Received: from 192.168.1.204 (192.168.1.204:143) by
   mailgateway.linguitronics.com with IMAP4; 20 Jul 2017 03:44:32 -0000

Received: from ScrolloutF1.linguitronics.com (unknown [192.168.1.205])
     by tw.linguitronics.com (Postfix) with ESMTP id 5A3E64023A
     for <[hidden email]>; Thu, 20 Jul 2017 11:35:56 +0800 (CST)
Received: from localhost (localhost [127.0.0.1])
     by ScrolloutF1.linguitronics.com (Postfix) with ESMTP id 3xCfgc5PKRzHr9d
     for <[hidden email]>; Thu, 20 Jul 2017 11:35:56 +0800 (CST)
Received: from ScrolloutF1.linguitronics.com ([127.0.0.1])
     by localhost (scrolloutf1.linguitronics.com [127.0.0.1]) (amavisd-new, port 10024)
     with LMTP id uAebWOExfOQd for <[hidden email]>;
     Thu, 20 Jul 2017 11:35:55 +0800 (CST)
Received: from lists.squid-cache.org (lists.squid-cache.org [104.130.201.120])
     by ScrolloutF1.linguitronics.com (Postfix) with ESMTP id 3xCfgP4p5LzHr9b
     for <[hidden email]>; Thu, 20 Jul 2017 11:35:39 +0800 (CST)

>[yes I wish our sysadmin could stop that bouncing, but the tools seem
>to be limited].

removing [hidden email] from recipients should fix the problem.
I'm sending Cc: there so the culprit knows what to fix on their side.

--
Matus UHLAR - fantomas, [hidden email] ; http://www.fantomas.sk/
Warning: I wish NOT to receive e-mail advertising to this address.
Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
Chernobyl was an Windows 95 beta test site.
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Re: This list generates a forward loop ...

Amos Jeffries
Administrator
On 20/07/17 21:43, Matus UHLAR - fantomas wrote:
> On 20.07.17 17:16, Amos Jeffries wrote:
>> Your DKIM signature covers the Subject and To headers. Any normal
>> mailing list will modify those,
>
> I disagree - IMHO sane listservers don't modify those headers.
>

Sadly, sane != normal. I'm referring to the common popular list servers.
We have used several of them over the years.


>> so your server cannot do that on list postings. Content-Type is also
>> changed sometimes by our listserver due to the list policy on binary
>> attachments, I dont know whether that is a common practice too but I
>> suspect it might be. The others should be fine AFAIK.
>
> This is a better example. However, mailserver supporting DKIM should strip
> the DKIM header if it's going to modify anything signed.
> Other solution is to refuse message (when the signer domain SKIM policy is
> signall).
>


<https://wiki.list.org/DEV/DKIM> and the discussions it links to explain
the issues around DKIM in a fair bit of detail, including why even
removal does not work.

(/me reading that page is brining on a greybeard moment. DKIM vs SPF was
the hot topic when I switched from mail to proxy focused work. Heck, 10
years of Squid).

Amos
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