[SmartcardServices-Users] Sending S/MIME Smartcard-Signed E-Mail on Mavericks

Hello List! I use a SuisseID Smartcard to send signed E-Mail through Outlook. Outlook recognizes that the smart card is inserted into the Mac and lets me sign it properly. However, Mail.app does not show me the usual sign/encrypt buttons. The feature is still there, since it works when a certificate/key pair is installed directly in the keychain (from symantec in that instance). Any experience with that? Cheers Chris