[Mailman-Users] Blank emails due to convert_html_to_plaintext

Michael Bakonyi kontakt at michaelbakonyi.de
Sun Apr 8 08:08:49 EDT 2018 

Dear Mailman-enthusiasts,

I administer a list, where emails by some senders (e.g. the german mass-mailprovider GMX)  arrive with a stripped message (but existing Mailman-footer) due to convert_html_to_plaintext enabled. Following you find other settings:

filter_content: yes
pass_mime_types:

multipart/mixed
multipart/alternative
text/rtf
text/plain
text/comma-separated-values
text/tab-separated-values
image
text/html
message/rfc822

I don't see the option "collapse multipart/alternative" anywhere (which is mentioned in other threads regarding empty mails) so I guess it's an older version of Mailman. I don't have access to any configuration-files as it's a Mailman-instance of a shared hoster. Here's a test-email where the message would be stripped (X-Provags-ID and X-UI-Out-Filterresults shortened for better readability).

Delivery-date: Sun, 08 Apr 2018 13:56:12 +0200
Received: from [80.67.18.6] (helo=mx06.ispgateway.de)
	by mailcluster2-1.ispgateway.de with esmtp (Exim 4.90_1)
	(envelope-from <m.bakonyi at gmx.net>)
	id 1f58vc-0007ME-Ov; Sun, 08 Apr 2018 13:56:12 +0200
Return-path: <m.bakonyi at gmx.net>
X-Envelope-to: bla at blub.de
Received: from [212.227.17.20] (helo=mout.gmx.net)
	by mx06.ispgateway.de with esmtps (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128)
	(Exim 4.90_1)
	(envelope-from <m.bakonyi at gmx.net>)
	id 1f58vi-00032J-W2
	for bla at blub.de; Sun, 08 Apr 2018 13:56:19 +0200
Received: from [91.63.233.19] ([91.63.233.19]) by 3c-app-gmx-bs65.server.lan
 (via HTTP); Sun, 8 Apr 2018 13:56:12 +0200
MIME-Version: 1.0
Message-ID: <trinity-cce054f8-f6f7-442a-a026-7132987a4a59-1523188571988 at 3c-app-gmx-bs65>
From: "Michael Bakonyi" <m.bakonyi at gmx.net>
To: bla at blub.de
Subject: test
Content-Type: text/html; charset=UTF-8
Date: Sun, 8 Apr 2018 13:56:12 +0200
Importance: normal
Sensitivity: Normal
X-Priority: 3
X-Provags-ID: shortened
X-UI-Out-Filterresults: notjunk:1;shortened
X-Received-SPF: pass ( mx06.ispgateway.de: domain of gmx.net designates 212.227.17.20 as permitted sender )
X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on
	spamfilter16.ispgateway.de
X-Spam-Level:
X-Spam-Status: No, hits=0.0 required=9999.0 tests=BAYES_50 autolearn=disabled
	version=3.4.0
X-Spam-CMAETAG: v=2.2 cv=TruWvHfh c=1 sm=1 tr=0
	a=EDFhQv9wJ3PvMGwfvWgztQ==:17 a=IkcTkHD0fZMA:10 a=x7bEGLp0ZPQA:10
	a=z6JOVgwrxLwA:10 a=Kd1tUaAdevIA:10 a=7lxF1IeVJ3SWydATLDQA:9
	a=_W_S_7VecoQA:10 a=QEXdDO2ut3YA:10
X-Spam-CMAECATEGORY:
X-Spam-CMAESUBCATEGORY:
X-Spam-CMAESCORE:

<html><head></head><body><div style="font-family: Verdana;font-size: 12.0px;"><div>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</div></div></body></html>

If i turn off convert_html_to_plaintext the mails of the user passes.

Is there anything I can do other to turning conversion of HTML off? Actually I don't want to allow HTML-mails ... Maybe a charset-related problem?

Cheers,
Michael


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