On 2/3/22 13:16, Christian via Mailman-Users wrote:
Hello Mark Sapiro. On Thu, 3 Feb 2022 11:28:00 -0800, you wrote:

Can you post the headers of the message as sent from the list?

Of course. Here it is:

...
X-Ham-Report: Spam detection software, running on the system
"crift.digimouse.eu", has NOT identified this incoming email as
spam.  The original message has been attached to this so you can view
it or label similar future email.  If you have any questions, see
root\@localhost for details. Content preview:  systemerweiterungen,
benutzer, dein account, startobjekte: ist da noch was drin? Jean-Luc
Aeby CH-4052 Basel > Am 03.02.2022 um 09:05 schrieb Max Röthlisberger
Mus <mus...@gmx.net>: > > Guten Morgen zusammen > > Mein MacBook Pro,
OS 10.11.6 sucht zu Hause nach einem Neustart 4 - 5 > mal im Heimnetz
den ? [...]  Content analysis details:   (-0.0 points, 4.0 required)
pts rule name              description ---- ----------------------
-------------------------------------------------- 0.0
URIBL_BLOCKED          ADMINISTRATOR NOTICE: The query to URIBL was
blocked.  See
http://wiki.apache.org/spamassassin/DnsBlocklists#dnsbl-block for
more information. [URIs: mus.ch] -0.0 BAYES_40               BODY:
Bayes spam probability is 20 to 40% [score: 0.2865] -0.0
SPF_PASS               SPF: sender matches SPF record 0.0
KAM_SHORT              Use of a URL Shortener for very short URL -0.0
T_SCC_BODY_TEXT_LINE   No description available.
...


This is the only header in the message that looks suspicious. I suspect the `?` characters are actually non-ascii characters in an unencoded header and that's the problem. I think whatever is adding this header (SpamExperts ?) is the root of the problem. If this can be configured to not add that X-Ham-Report: header, that may solve the issue.

Or, you could patch https://bazaar.launchpad.net/~mailman-coders/mailman/2.1/view/head:/Mailman/Handlers/Cleanse.py#L62 and add
```
        del msg['X-Ham-Report']
```
to have Mailman remove it. That may help.


--
Mark Sapiro <m...@msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan
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