make_encoded_mail_body.js

function makeBody(to, from, subject, message) {
	var btoa = require('btoa');
	var str = ["Content-Type: text/plain; charset=\"UTF-8\"\n",
		"MIME-Version: 1.0\n",
		"Content-Transfer-Encoding: 7bit\n",
		"to: ", to, "\n",
		"from: ", from, "\n",
		"subject: ", subject, "\n\n",
		message
	].join('');
	return btoa(str);
}