Neat idea. Quibbles: 1) No explanation of what you're doing. Minimalism is good, being completely text-free not so much. 2) Entering an invalid email address,

Neat idea. Quibbles: 1) No explanation of what you're doing. Minimalism is good, being completely text-free not so much. 2) Entering an invalid email address, I get something that looks like a mangled smartquote (opera on ubuntu): 'Email address Recipient’s email(s) is not valid.'