2 Jul
2014
2 Jul
'14
5:25 p.m.
Hello Martijn,
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 after decryption.
Which loggers do I have to switch to debug to see, what happens to the attachment?
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.
Kind regards,
Stefan
2 Jul
2 Jul
5:59 p.m.
On 07/02/2014 05:25 PM, Stefan Michael Guenther wrote:
Hello Martijn,
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 after decryption.
Do you have the MIME source of a message after decryption? or is it
completely empty?
Are there any error messages in the MPA log?
Which loggers do I have to switch to debug to see,
what happens to the attachment?
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.
The first thing to find out how you can detect which mails should be
watched for. One option would be to add a matcher/mailet to config.xml
which matches for a specific recipient and then send a copy of the email
to some other address before and after decryption.
You might also do this in Postfix I think with recipient_bcc_maps
http://www.postfix.org/postconf.5.html#recipient_bcc_maps
Then if you have the message source before and after decryption we can
further analyse it
Kind regards,
Martijn Brinkers
--
CipherMail email encryption
Open source email encryption gateway with support for S/MIME, OpenPGP
and PDF messaging.
http://www.ciphermail.com
Twitter: http://twitter.com/CipherMail
10 Jul
10 Jul
9:37 p.m.
On 07/02/2014 05:25 PM, Stefan Michael Guenther wrote:
Hello Martijn,
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
after decryption.
Which loggers do I have to switch to debug to see, what happens to
the attachment?
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.
Kind regards,
Martijn Brinkers
--
CipherMail email encryption
Open source email encryption gateway with support for S/MIME, OpenPGP
and PDF messaging.
http://www.ciphermail.com
Twitter: http://twitter.com/CipherMail
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2 comments
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participants (2)
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Martijn Brinkers -
Stefan Michael Guenther