On 07/02/2014 05:25 PM, Stefan Michael Guenther wrote:
one of our clients receives encrypted emails with a single small text
attachment, send by some specialized appliance.
The problem is, that after decryption, the attachment seems to have
disappeared. Since the attachment only contains one or two lines of
text, it isn't helpful to compare the size of the email before and
Which loggers do I have to switch to debug to see, what happens to
Since there is a large number of other emails with attachments, which
are decrypted correctly, I doubt that it is a Djigzo problem. But at
least we have to proof it.
For the record, since it might help someone else having a similar
problem, it turned out that the message was correctly decrypted however,
the resulting message was opaquely signed. An opaquely signed message
can only be read with an S/MIME aware application (a clear signed
message can be read like a normal email). Since the mail application
that had to extract the attachment was not capable of reading S/MIME
opaque signed email, it did not detect the attachment. The solution was
to have the gateway remove the digital signature by checking the
advanced S/MIME setting "Remove signature". The will remove the S/MIME
signature which then results in a normal email with the attachment.
CipherMail email encryption
Open source email encryption gateway with support for S/MIME, OpenPGP
and PDF messaging.