This is what the text looks like after sending it from the form: e-mail form without parsing

UserName=wayne+c.+summers&e-mail=wsummers%40cs.nmhu.edu&course=math&comments=This+shows+-+all+of+the+%22different%22+characters%21%3F%21

Note the hex characters for %40 for @, %22 for ", %21 for ! and %3F for ?