Big company sents 0 character in voicemail messages

Paul van der Vlis <[email protected]>
Newsgroups gmane.mail.imap.cyrus
Message-ID <[email protected]>
Hello,

Here in the Netherlands the biggest telephone company (KPN) does sent 
voicemail messages with a 0 character in the text-part. Something like 
this, look for <C0><80>:
-----------
<headers>

--MM3-12345-789
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit

Je hebt een nieuwe voicemail ontvangen van 06xxxxxxxx op 21/05/2022 om 
22:51:35 uur. Het bericht duurt 9 seconden.<C0><80>

--MM3-12345-789
Content-Type: audio/mpeg
Content-Disposition:attachment; filename= "voicemail.mp3"
Content-Transfer-Encoding:base64

//uQRAAAAAAAAAAAAAAAAAAAA (...)
--MM3-12345-789--
-------------

For so far I know <C0><80> is a overlong coded nulcharacter:
https://en.wikipedia.org/wiki/UTF-8#Modified_UTF-8

Cyrus IMAP says:
----
May 21 14:10:34 sigmund postfix/lmtp[29862]: E5D0C2041C:
to=<[email protected]>,
relay=mail.vandervlis.nl[/var/run/cyrus/socket/lmtp], delay=0.19,
delays=0.14/0.02/0.03/0.01, dsn=5.6.0, status=bounced (host
mail.vandervlis.nl[/var/run/cyrus/socket/lmtp] said: 554 5.6.0 Message
contains NUL characters (in reply to end of DATA command))
----

Some ideas what to do?

With regards,
Paul van der Vlis

-- 
Paul van der Vlis Linux systeembeheer Groningen
https://vandervlis.nl/

------------------------------------------
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