Your totally right, my bad I'm used to sometimes people posting who might not know the background. In this case I didn't know! For some reason I had it in my head that openssl was always used for the signing and decrypting. I had no idea it was gnupg, but thanks for letting me know.

So, it appears I'm outta luck then. And if Modest goes live and doesn't include S/MIME I'm really gonna be outta luck