Strange characters in email from TB to mailcow

stefan21

Here’s a snippet from an email composed in TB and opened in mailcow SOGO in the sent-Folder, NOT in source code (Quelltext):

Sehr geehrte Damen und Herren,

anbei erhalten Sie als Anlage unsere Auftragsbestätigung Nr. 123456 zu2=20
Ihrer Bestellung vom 06.11.2024. Ihre Kundennr. bei uns ist 00000.

Wir danken für Ihren Auftrag und verbleiben

—

Now the view in source code (Quelltext):

by 3c90ade430e1 with LMTP
id mIVmIUMpK2f9QAAAxNjymA
(envelope-from info@sender.de)
for maillog@sender.de; Wed, 06 Nov 2024 09:30:59 +0100
Received: from bcc (mailcowdockerized-rspamd-mailcow-1.mailcowdockerized_mailcow-network [172.22.1.5])
by mail.sender.de (Postcow) with SMTP id 6F3101A08AB
for maillog@sender.de; Wed, 6 Nov 2024 09:30:59 +0100 (CET)
Content-Type: multipart/mixed; boundary=“————zILwz9261YXPm5mabMEKlELX”
Message-ID: cc3c2a92-54e2-4e84-9cca-86111c791798@sender.de
Date: Wed, 6 Nov 2024 09:30:58 +0100
MIME-Version: 1.0
User-Agent: Mozilla Thunderbird
To: oc.domain@receiver.com
Subject: XXX; hier: AB123456 vom 06.11.2024 - Ihre Best Nr.
12345678
Reply-To: info@sender.de
From: Info info@sender.de
Organization: XXX GmbH

————–zILwz9261YXPm5mabMEKlELX
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable

Sehr geehrte Damen und Herren,

anbei erhalten Sie als Anlage unsere Auftragsbest=C3=A4tigung Nr. 257599 zu=
=2=20
Ihrer Bestellung vom 06.11.2024. Ihre Kundennr. bei uns ist 00000.

Wir danken f=C3=BCr Ihren Auftrag und verbleiben,

–=20
Mit freundlichen Gr=C3=BC=C3=9Fen,

Where does the character insertion of “2=20” in the normal SOGo view come from?

Any help or hints are greatly appreciated.

regards,
stefan

DocFraggle

Look like an encoding issue, most likely something related to UTF-8 and special and new-line characters. I would check your TB settings regarding email encoding

stefan21

Took a closer look in this problem:

emails in the user sent folder of SOGo showing the source code as followed:

MIME-Version: 1.0
User-Agent: Mozilla Thunderbird
Reply-To: X
To: Y
From: “X” <X>
Subject: test
Organization: X GmbH
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit

In i.e. mailbox.org it looks like this:

MIME-Version: 1.0
User-Agent: Mozilla Thunderbird
Reply-To: X
To: Y
From: “X” <X>
Subject: test
Organization: X GmbH
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
X-Last-TLS-Session-Version: TLSv1.3

I think I catched the bug: disabling the domain wide footer in plain text and the error is gone. There was no footer in html format. I’ll try composing an email if both formats in the footer are defined.

Yep. It’s the domain-wide footer causing the error.

To test: use TB as client. Send an email with no domain-wide footer in mailcow defined. Email is displayed correct in receivers client. Define a domain-wide footer. Send an email composed in TB. Receiver will receive email with weird formatted lines/characters.

With no domain wide footer the encoding for the receiver shown in the source code:

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

Enabling the domain wide footer changes the encoding. Which causes the error.

stefan21

Could be related to already reported bugs, not quite sure:

mailcow/mailcow-dockerized5892

and

mailcow/mailcow-dockerized6132

Would be nice to have this fixed. Looks very unprofessional in business emails…