It's interesting. I was able to use your on line form to try the form data retrieval issues, so I think it must have worked somehow. The paper size "letter" is to solve your data retrieval issue, not the save data problem.
I don't know exactly what happened with the error code to send out emails. Your form works fine with my duplicated copy. I will send the issue to our engineers to get their help.
Thanks,
Wenlan