I have a workbook which I have written code which will not allow the user to
save the workbook unless they have provided specific pieces of information.

I had intended to not allow users to Email the worbook without the specific
information being present. My thought process was if they cannot save it
they
cannot attached it to an Email.

What users have found a way to do is to Email the unsaved workbook using
SendTo.

Can anyone suggest any way I can stop the users doing this?