Dear all,
today I recived a user complain that his messages were rejected with error "The message's content type was not explicitly allowed"
I checked the list and indeed, it was configured to filter content and to allow only a very limited number of content types, namely application/pdf and image/jpeg.
After some experiments, the problems seems to be the s/mime signature. The messages contain a signature: <snip> Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s"
<snap>
I added this type to the allowed MIME content type, but signed messages are still rejected.
What do I miss?
Viele Grüße,
Rainer Herbst Leiter IT-Service Phone: +49 331 7499-257 e-mail: rainer.herbst@aip.de https://www.aip.de
Leibniz-Institut für Astrophysik Potsdam (AIP) An der Sternwarte 16, 14482 Potsdam
Vorstand: Prof. Dr. Matthias Steinmetz, Wolfram Rosenbach Stiftung bürgerlichen Rechts Stiftungsverzeichnis Brandenburg: 26 742-00/7026
Mailman's content filtering has removed the following MIME parts from this message.
Content-Type: application/x-pkcs7-signature Name: smime.p7s