Hello,

I have following problem with outlook 2007. I want to attach a S/MIME to a new mail. There is no problem creating such a mail but my problem is if I receive this mail and try to open the S/MIME attachment then an error occurrs: "An error occurred in the underlying security system. Internal error."

The S/MIME attachment is valid because if I sign the mail to which the S/MIME is attached then everything works.

I also tried to open the mail in Windows Vista "Windows Mail" and there is no problem if the mail with the S/MIME attachment is signed or not.

Are there any settings i have to change in outlook or isn't it possible to attach S/MIME to an unsigned mail?

Thanks for every help!

Regards,
avaj