Setting sign & encrypt flag

Hello,

I’m communicating with lotus notes through ole objects (from c++) to saving an email as draft. Im setting all the properties for the email, but the two flags sign and encrypt. How can I set this?

I tried already

doc.OlePropertySet(“Sign”, true);

doc.OlePropertySet(“Sign”, “1”);

doc.OlePropertySet(“SignOnSend”, true);

…

Does someone know how to make this?

Regards,

Mike