On 03/09/2015 02:40 PM, Sebastian Nielsen wrote:
What causes this? See the attached EML file. The
mail is duplicated
(with duplicate MIME headers) into a attached file, when Djigzo
validates the mail. What can cause such a “mishap”?
This does only happen with lists.djigzo.com
The reason for this is a bit technical. The message sent by Andreas was
S/MIME digitally signed. Since the mailing list server (mailman) needs
to add a banner to the message, it needs to modify the message. The
authors of mailman decided to create a new multipart/mixed part, add the
signed message as a sub-part and then added the banner. The problem now
is that the resulting message is no longer a valid S/MIME message. The
CipherMail gateway however can detect this situation and "repair" the
message to be a valid S/MIME message. It does this by detecting that a
part is S/MIME. This part is then converted into an attached message
(hence the attached message.eml name). This attached message is a valid
S/MIME message which can be validated with your email client. The main
reason for adding this is that there are a lot of "add banner to
outgoing email" services which mess-up S/MIME email because those
services do not understand S/MIME.
I forgot to exclude this list from S/MIME...
Should be ok now