The below link ( http://support.microsoft.com/default.aspx?scid=kb;EN-US;q318215
) have tell us how to send a multipart SIME signed email without attachment.
My question is How to send multipart SMIME signed email WITH attachment.
For Microsoft example above, I have test it by adding the attachment command to the message, however, the response of the Mailbox in Outlook tell me that "Invalid Header". So I suspect even the attachment need to be signed ot something...
Anyone can help me?