On Mon, Mar 10, 2025 at 08:14:33PM +0100, Andreas Kuhlen via Postfix-users 
wrote:

> I have two mail servers that use different content transfer encodings
> for the same content. Based on the configuration, I can't work out why
> this is the case.

The list is not psychic, you can examine your servers, but we cannot.
The author should check the raw copy of the message in the "Sent"
mailbox, and determine what format that's in.  Then you can craft
specific test messages outside the user agent and send them through
to see how they're processed.  Use the "-B <bodytype>" option of
sendmail(1) to send suitably chosen MIME messages.

> Old server configuration:
> 
> This is a multi-part message in MIME format.
> --------------xCVMqE18V5Y1jiksDIgdQocF
> Content-Type: text/plain; charset=UTF-8; format=flowed
> Content-Transfer-Encoding: quoted-printable

The message originated that way, or was converted in transit.

> Alles Liebe! =C3=A4=C3=B6=C3=BC =C3=84=C3=96=C3=9C=C3=9F=C3=9F=C3=9F

Which seems to be:

> Alles Liebe! äöü ÄÖÜßßß

> A new server configuration:
> This is a multi-part message in MIME format.
> 
> --------------MAHcd6dkL648us1Y5Q3mVue0
> Content-Type: text/plain; charset=UTF-8; format=flowed
> 
> Content-Transfer-Encoding: 8bit
> 
> Das ist ein Test.
> 
> Alles Liebe! äöü ÄÖÜßßß

Something appears to have mangled the encoding along the way.

-- 
    Viktor.
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