Hello Hilary,
I have built the form just as you wrote with two sections in one view and a "helper field" that is of type boolean. The rules on the submit are set just as you wrote. When I execute/run the form on my PC - the same one that I developed the form on - the form behaves as intended.
The editing section is displayed at form load, I can complete the form, click the submit button on the InfoPath ribbon, the email section displays with all of the labels and values just as intended with the "email submit" dialog box displayed (the one with Send and Cancel buttons).
The seemingly simplest publishing method for me was to publish to a file share. I got around the odd domain security/trust issue by setting the security level to Full Trust and creating a self-sign certificate - maybe not so elegant or maybe not even the recommended way to clear the problem but I could find no other way to eliminate the domain security/trust issue. Publishing to a SharePoint/WSS forms library definitely did not work.
Once I published the form to the file share, the user could execute the form without the domain security/trust error warning, they could complete the form, but when they click on submit, the editing section is hidden, and what appears to be a simplified (meaning no ribbon) blank (with nothing in the message body) outlook new message form appears and there is no email submit dialog box.
I am nearing the deadline on what I thought would be an easy thing to complete. Any ideas you can pass along would be greatly appreciated.
Thanks and regards,
Jim