Specifies whether to include a detached signature when signing a message.
This property specifies whether to include a detached signature when signing a message. If the value of this property is True, Message will be encoded as a multipart/signed mime message with a detached signature when calling Sign. This will create a message with two mime parts, one with the contents of Message, and another with the detached signature.
If this property is False, the current contents of Message will be PKCS encoded and included with the signature in Message. This will create a single part message with no MIME boundaries.