KMail and smartcard

[Chris]

I have just installed a smartcard reader and set it up. I can successfully 
read the information on it and managed to generate a new key on it (gpg 
--card-list / gpg ---card-edit).

How can I use the smartcard in KMail? I cannot choose its keys in the Identity 
management.

Using a key from the harddrive does work without problems.

Any help is highly appreciated!

Thanks,
Chris