React Base Fiddle (JSX)

Starting point for creating JSFiddles with React.

HTML

<script src="https://unpkg.com/react@16/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
<script src="https://smtpjs.com/v3/smtp.js">
</script>
<div id="container">
    <!-- This element's contents will be replaced with your component. -->
</div>

Babel + JSX

class Hello extends React.Component {
	constructor(props){
    super(props)
    this.sendMail = this.sendMail.bind(this);
  }

  sendMail() {
     window.Email.send({
        SecureToken : "C973D7AD-F097-4B95-91F4-40ABC5567812",
        To : 'them@website.com',
        From : "you@isp.com",
        Subject : "This is the subject",
        Body : "And this is the body"
    }).then(
  message => alert(message)
);
   }
  render() {
    return (
    	<button onClick={this.sendMail} > Send Mail </button>
    )
  }
}

ReactDOM.render(
  <Hello name="World" />,
  document.getElementById('container')
);