Attachments within S/MIME mails which are "both" encrypted and signed cannot be saved. Below follows an example of some fields of the e-mail header:

Content-Type: application/pkcs7-mime; name="smime.p7m"; smime-type="enveloped-data"
Content-Disposition: attachment; filename="smime.p7m"
Content-Transfer-Encoding: base64
MIME-Version: 1.0

I have verified the same problem even when the mail is sent from different clients (Outlook or KMail itself).

This is similar to Bug 294272, but in this case it is related to S/MIME messages which are "both" signed and encrypted. If the message is only signed, or only encrypted, the problem does not occur.


Reproducible: Always

Steps to Reproduce:
Receive an S/MIME message, which is both signed and encrypted, containing an attachment.
Actual Results:  
An attachment is displayed as a link inside the message window, but the link cannot be opened / downloaded. There does not seem to be any way to view or save the attachment.

Expected Results:  
The link / attachment should be downloadable / saveable.

Similar to Bug 294272, but in this case it is related to S/MIME messages which are both signed and encrypted. If the message is only signed, or only encrypted, the problem does not occur.