Hello,
We have also encountered this issue sporadically with our Docker-based Mailman 
installation (maxking/mailman-web and maxking/mailman-core 0.5.2).

Here are excerpts from the email sent to the LIST-request address: (sent by 
Outlook/Exchange)
>>>
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
MIME-Version: 1.0

DQo=
<<<

And here is the response:
>>>
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
MIME-Version: 1.0

Difvv73vv70H77+977+9Kyx477+9a3rvv70gailK77+9ae+/ve+/ve+/vSzvv73vv73vv716e++/
ve+/ve+/vdqeB++/vXooLQ0K77+9Wu+/vVsdeu+/vSvvv70I77+9alfvv70177+9Ie+/vSch77+9
WicaV++/ve+/vd2t77+9Andree+/vQbvv73orJdo77+9DQo=
>>>>
This does not appear to be base64-encoded UTF-8.

Does anyone have any idea how to fix this?
Best regards,
Frank
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