Other forms on the site work. I contacted the host provider anyway and added the credentials for their mail server into the UE dialog box (also checked the box at bottom), but still no send. The other form, ContactUs.php didn't have the credentials, but still sent an email.
Thought it might also be the form page trying to send data with no bindings on the email page (blank_2), so I reworked the email page, but still no send.
I have a file upload button on the form page with no binding on the email page, but even if I don't attach a file, it still doesn't send.
Also, what binding should be used for the file attachment? The blank_2.php form bindings list doesn't show a binding for that.