When certain mail goes through the PMG relay, it looks broken in the mail.

kuri_gohan

New Member
Apr 8, 2024
5
1
3
Hello, I've been using Proxmox Mail Gateway well for a year.

In the meantime, some customers had problems.

If you attach an image from a specific homepage form mail, it will damage the mail when you relay in pmg.

Gmail or naver large email platforms were able to receive this email normally.

Even a single postfix could be received without any problems.

Here is the email header.

# Corrupted email source
Return-Path: <root@uws8-wpm-034.cafe24.com>
Delivered-To: info@daewonind.com
Received: from c33.nskorea.com (c33.nskorea.com [222.231.3.33])
by c73.nskorea.com (Postfix) with ESMTPS id 7B826B1F6D001
for <info@daewonind.com>; Wed, 16 Oct 2024 15:28:55 +0900 (KST)
Received: from c33.nskorea.com (localhost.localdomain [127.0.0.1])
by c33.nskorea.com (Postfix) with ESMTP id 3511914837E
for <info@daewonind.com>; Wed, 16 Oct 2024 15:28:55 +0900 (KST)
Received: from uws8-wpm-034.cafe24.com (unknown [183.111.183.31])
by c33.nskorea.com (Postfix) with ESMTPS id 0DE1B1483C6
for <info@daewonind.com>; Wed, 16 Oct 2024 15:28:52 +0900 (KST)
Received: (qmail 1840 invoked by uid 1080); 16 Oct 2024 15:28:52 +0900
To: info@daewonind.com, sch8601@naver.com, lwh0002@gmail.com
Subject: =?UTF-8?B?W+uMgOybkOyCsOyXhSDtmYjtjpjsnbTsp4BdIHRlc3Qx?=
Date: Wed, 16 Oct 2024 06:28:52 +0000
From: =?UTF-8?B?64yA7JuQ7IKw7JeF?= <info@daewonind.com>
Reply-To: info@daewonind.com
Message-ID: <oRx1l6SMoXNmzKrLEnmGByTGafnOKNJ4GHjcOQKDz8M@daewon03.mycafe24.com>
X-Mailer: PHPMailer 6.8.1 (https://github.com/PHPMailer/PHPMailer)
MIME-Version: 1.0
Content-Type: multipart/mixed;
boundary="b1=_oRx1l6SMoXNmzKrLEnmGByTGafnOKNJ4GHjcOQKDz8M"
Content-Transfer-Encoding: 8bit
X-SPAM-LEVEL: Spam detection results: 2
BASE64_LENGTH_78_79 0.1 -
BAYES_00 -1.9 Bayes spam probability is 0 to 1%
DMARC_NONE 0.1 DMARC none policy
HEADER_FROM_DIFFERENT_DOMAINS 0.249 From and EnvelopeFrom 2nd level mail domains are different
HTML_MESSAGE 0.001 HTML included in message
HTML_MIME_NO_HTML_TAG 0.377 HTML-only message, but there is no HTML tag
KAM_DMARC_NONE 0.25 DKIM has Failed or SPF has failed on the message and the domain has no DMARC policy
KAM_DMARC_STATUS 0.01 Test Rule for DKIM or SPF Failure with Strict Alignment
KAM_NUMSUBJECT 0.5 Subject ends in numbers excluding current years
MIME_HTML_ONLY 0.1 Message only has text/html MIME parts
MISSING_MIME_HB_SEP 0.001 Missing blank line between MIME header and body
RDNS_NONE 0.793 Delivered to internal network by a host with no rDNS
SPF_HELO_PASS -0.001 SPF: HELO matches SPF record
SPF_PASS -0.001 SPF: sender matches SPF record
TO_NO_BRKTS_HTML_IMG 1.619 To: lacks brackets and HTML and one image


--b1=_oRx1l6SMoXNmzKrLEnmGByTGafnOKNJ4GHjcOQKDz8M


--b1=_oRx1l6SMoXNmzKrLEnmGByTGafnOKNJ4GHjcOQKDz8M
Content-Type: image/jpeg; name="=?UTF-8?B?64uk7Jq066Gc65OcLmpwZw==?="
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="=?UTF-8?B?64uk7Jq066Gc65OcLmpwZw==?="




--b1=_oRx1l6SMoXNmzKrLEnmGByTGafnOKNJ4GHjcOQKDz8M--





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# a normal email source
Return-Path: <root@uws8-wpm-034.cafe24.com>
Delivered-To: info@daewonind.com
Received: from uws8-wpm-034.cafe24.com (unknown [183.111.183.31])
by c73.nskorea.com (Postfix) with ESMTPS id 28CB7B1F60CAE
for <info@daewonind.com>; Wed, 16 Oct 2024 13:52:06 +0900 (KST)
Received: (qmail 22364 invoked by uid 1080); 16 Oct 2024 13:52:06 +0900
To: info@daewonind.com, sch8601@naver.com
Subject: =?UTF-8?B?W+uMgOybkOyCsOyXhSDtmYjtjpjsnbTsp4BdIHRlc3Qx?=
Date: Wed, 16 Oct 2024 04:52:06 +0000
From: =?UTF-8?B?64yA7JuQ7IKw7JeF?= <info@daewonind.com>
Reply-To: info@daewonind.com
Message-ID: <XBYfvQJ6mFOSfzh8hgSrkliRxidMBW6d2VnMUhfM@daewon03.mycafe24.com>
X-Mailer: PHPMailer 6.8.1 (https://github.com/PHPMailer/PHPMailer)
MIME-Version: 1.0
Content-Type: multipart/mixed;
boundary="b1=_XBYfvQJ6mFOSfzh8hgSrkliRxidMBW6d2VnMUhfM"
Content-Transfer-Encoding: 8bit


--b1=_XBYfvQJ6mFOSfzh8hgSrkliRxidMBW6d2VnMUhfM
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

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=EC=9D=98</span></div><hr><div class=3D"kboard-document-add-option-value me=
ta-key-company"><span class=3D"option-name">=ED=9A=8C=EC=82=AC=EB=AA=85</sp=
an><span class=3D"option-separator"> : </span><span class=3D"option-value">=
test1</span></div><hr><div class=3D"kboard-document-add-option-value meta-k=
ey-name"><span class=3D"option-name">=EC=84=B1=ED=95=A8</span><span class=
=3D"option-separator"> : </span><span class=3D"option-value">test1</span></=
div><hr><div class=3D"kboard-document-add-option-value meta-key-email"><spa=
n class=3D"option-name">=EC=9D=B4=EB=A9=94=EC=9D=BC=EC=A3=BC=EC=86=8C</span=
><span class=3D"option-separator"> : </span><span class=3D"option-value">te=
st1@naver.com</span></div><hr><div class=3D"kboard-document-add-option-valu=
e meta-key-number"><span class=3D"option-name">=EC=97=B0=EB=9D=BD=EC=B2=
=98/=ED=9C=B4=EB=8C=80=ED=8F=B0</span><span class=3D"option-separator"> : <=
/span><span class=3D"option-value">test1</span></div><hr></div><p><a href=
=3D"https://daewon03.mycafe24.com/?kboard_content_redirect=3D380" style=3D"=
display: inline-block; padding: 7px 30px; font-size: 15px; color: #ffffff; =
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=EC=9E=91=EC=84=B1=EA=B8=80=EB=A1=9C =EC=9D=B4=EB=8F=99</a></p><p>=EB=A7=
=81=ED=81=AC=EA=B0=80 =EC=9E=91=EB=8F=99=ED=95=98=EC=A7=80 =EC=95=8A=
=EC=9C=BC=EB=A9=B4 =EB=8B=A4=EC=9D=8C URL=EC=9D=84 =EB=B3=B5=EC=82=AC=
=ED=95=98=EC=97=AC =EB=B8=8C=EB=9D=BC=EC=9A=B0=EC=A0=80=EC=97=90 =EB=B6=
=99=EC=97=AC =EB=84=A3=EC=9C=BC=EC=84=B8=EC=9A=94: <br><span style=3D"color=
: #0073aa;">https://daewon03.mycafe24.com/?kboard_content_redirect=3D380</s=
pan></p>
--b1=_XBYfvQJ6mFOSfzh8hgSrkliRxidMBW6d2VnMUhfM
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2Q==

--b1=_XBYfvQJ6mFOSfzh8hgSrkliRxidMBW6d2VnMUhfM--



The symptoms were the same even when the score of the PMG mail filter's Modify Header and the specific rule set of SA was zero.

Also, after deliberately letting me enter the quarantine, when I checked it on spam quarantine, the email is broken like the header above.

Is there a solution?
 
Do i see this correctly that after pmg the mime encoded picture is missing from the mail?
 
Do i see this correctly that after pmg the mime encoded picture is missing from the mail?
Thank you for your answer.
Below is the pmg log.


2024-10-16T15:32:02.734170+09:00 c33 postfix/smtpd[1652126]: connect from unknown[183.111.183.31]
2024-10-16T15:32:02.927605+09:00 c33 postfix/smtpd[1652126]: E26901483BB: client=unknown[183.111.183.31]
2024-10-16T15:32:02.932349+09:00 c33 postfix/cleanup[1653992]: E26901483BB: message-id=<oHfyIxGxKEUyGulKxfBFlGhmrXqMSpN3OqXdNRfnV44@daewon03.mycafe24.com>
2024-10-16T15:32:02.935215+09:00 c33 postfix/qmgr[977367]: E26901483BB: from=<root@uws8-wpm-034.cafe24.com>, size=11757, nrcpt=1 (queue active)
2024-10-16T15:32:02.937852+09:00 c33 postfix/smtpd[1652126]: disconnect from unknown[183.111.183.31] ehlo=2 starttls=1 mail=1 rcpt=1 data=1 quit=1 commands=7
2024-10-16T15:32:02.995533+09:00 c33 pmg-smtp-filter[1653909]: 1483CE670F5DE2EFB06: new mail message-id=<oHfyIxGxKEUyGulKxfBFlGhmrXqMSpN3OqXdNRfnV44@daewon03.mycafe24.com> #012
2024-10-16T15:32:04.413641+09:00 c33 pmg-smtp-filter[1653909]: 1483CE670F5DE2EFB06: SA score=2/5 time=1.295 bayes=0.00 autolearn=no autolearn_force=no hits=BASE64_LENGTH_78_79(0.1),BAYES_00(-1.9),DMARC_NONE(0.1),HEADER_FROM_DIFFERENT_DOMAINS(0.249),HTML_MESSAGE(0.001),HTML_MIME_NO_HTML_TAG(0.377),KAM_DMARC_NONE(0.25),KAM_DMARC_STATUS(0.01),KAM_NUMSUBJECT(0.5),MIME_HTML_ONLY(0.1),MISSING_MIME_HB_SEP(0.001),RDNS_NONE(0.793),SPF_HELO_PASS(-0.001),SPF_PASS(-0.001),TO_NO_BRKTS_HTML_IMG(1.619)
2024-10-16T15:32:04.418732+09:00 c33 postfix/smtpd[1653492]: connect from localhost.localdomain[127.0.0.1]
2024-10-16T15:32:04.420731+09:00 c33 postfix/smtpd[1653492]: 66A8F1483D8: client=localhost.localdomain[127.0.0.1], orig_client=unknown[183.111.183.31]
2024-10-16T15:32:04.466200+09:00 c33 postfix/cleanup[1653992]: 66A8F1483D8: message-id=<oHfyIxGxKEUyGulKxfBFlGhmrXqMSpN3OqXdNRfnV44@daewon03.mycafe24.com>
2024-10-16T15:32:04.467507+09:00 c33 postfix/qmgr[977367]: 66A8F1483D8: from=<root@uws8-wpm-034.cafe24.com>, size=2519, nrcpt=1 (queue active)
2024-10-16T15:32:04.467643+09:00 c33 postfix/smtpd[1653492]: disconnect from localhost.localdomain[127.0.0.1] ehlo=1 xforward=1 mail=1 rcpt=1 data=1 commands=5
2024-10-16T15:32:04.467956+09:00 c33 pmg-smtp-filter[1653909]: 1483CE670F5DE2EFB06: accept mail to <info@daewonind.com> (66A8F1483D8) (rule: default-accept)
2024-10-16T15:32:04.471290+09:00 c33 pmg-smtp-filter[1653909]: 1483CE670F5DE2EFB06: processing time: 1.486 seconds (1.295, 0.08, 0)
2024-10-16T15:32:04.472024+09:00 c33 postfix/lmtp[1653534]: E26901483BB: to=<info@daewonind.com>, relay=127.0.0.1[127.0.0.1]:10024, delay=1.7, delays=0.15/0/0.05/1.5, dsn=2.5.0, status=sent (250 2.5.0 OK (1483CE670F5DE2EFB06))
2024-10-16T15:32:04.472427+09:00 c33 postfix/qmgr[977367]: E26901483BB: removed
2024-10-16T15:32:04.694902+09:00 c33 postfix/smtp[1649539]: 66A8F1483D8: to=<info@daewonind.com>, relay=pop3s.ymail.net[222.231.3.220]:25, delay=0.27, delays=0.05/0/0.21/0.02, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as A5561B1F6D010)
2024-10-16T15:32:04.695283+09:00 c33 postfix/qmgr[977367]: 66A8F1483D8: removed

# a normal email
1729067057671.png




# Corrupted email
1729066916575.png


If there is anything else I can help you with to solve the problem, I would be happy to cooperate.
 
Content-Type: multipart/mixed;
boundary="b1=_XBYfvQJ6mFOSfzh8hgSrkliRxidMBW6d2VnMUhfM"
This new-line here is problematic - is this present in the mail before its sent out?

once I join the 2 lines the mail passes through PMG (with the new-line there are other issues (it's a broken MIME message) - and it gets displayed ok (as far as I can tell)

can you share the mail from the source before it's send over the internet?

(please use code tags for code and logs, and for the e-mail consider attaching it as file)
 
This new-line here is problematic - is this present in the mail before its sent out?

once I join the 2 lines the mail passes through PMG (with the new-line there are other issues (it's a broken MIME message) - and it gets displayed ok (as far as I can tell)

can you share the mail from the source before it's send over the internet?

(please use code tags for code and logs, and for the e-mail consider attaching it as file)
As MISSING_MIME_HB_SEP says, I think it's a problem caused by the lack of empty lines after MIME header.

First of all, I told the customer to add an empty line.

I'll send you a thread as soon as I have additional delivery.
 
Last edited:
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