I have tried a test form, I even tried a form you yourself posted as an example, and no matter what I do outlook doesn't populate the e-mail. Maybe it's an issue with the email client? I tried outlook and thunderbird and neither worked. I am using IP 2013 on Windows 10. Does it always need to go through outlook to send the email?
I'm at a loss, right now I'm looking into creating a workflow. It's already sending emails correctly on adding to a list, I just am having trouble wrapping my brain about adding to the list via infopath