Version:           unspecified (using Devel) 
OS:                Linux

It is impossible to sign an email using S/MIME at the moment.

Reproducible: Always

Steps to Reproduce:
Prerequisite: Having an S/MIME key

- Launch Kmail-mobile
- Open the 'Actions' tab
- Click on 'Identities'
- Select an identity and click on 'Modify...' button
- Go to the 'Cryptography' tab
- Scroll down to S/MIME signing certificate and click onto the 'Change...' button
- Select the signing certificate from the list
- Click on 'Ok' 3 times.
- Click on 'Write new Email' button
- Enter a subject, any recipient and a few words in the text editor
- Open the 'Actions' tab
- Click on 'Security'
- Click on 'Sign'
- A 'Message will be signed' on a green background appears underneath the email's subject
- Click on 'Send'

Actual Results:  
A 'No signing possible - KMail Mobile' pop up dialogue appears with the following message: 'Examination of recipient's signing preferences showed no common type of signature matching your available signing keys. Send the message without signing?'

The user can either click on a 'Cancel' or on a 'Continue' button.

Either way it is impossible to send an email signed using S/MIME atm whatever the user does.



Expected Results:  
It should be possible to send an email signed using S/MIME

N900, 4:4.6~20101125.1200370-1maemo1.1200491

Note: I tried sending a signed email to 4 different recipients but I always got that same error message.