Thank you Dennis. This is a clever way to do it. I would think, they would allow not to indicate the email address because most of the time the body of the email contains how to contact.
It does not appear that you can opt-out of that field. Qualtircs does offer a Qtip if you don't want to receive replies.
"Qtip: The email your use doesn’t have to be real. For example, if you don’t want to receive replies but want the address to look official, you can set the Reply-To to YourCompany@qemailserver.com."