Instead of using an "Email Submit Button", use a regular Button and add the following script (JavaScript) to its click event (change emails, subject and message as needed):
event.target.mailDoc({
bUI: false,
cTo: "apstory@example.com",
cCc: "dpsmith@example.com",
cSubject: "The Latest News",
cMsg: "A.P., attached is my latest news story in PDF."
});