@Test public void testCreateMessageMultipart() throws Exception {
String subject = "Subject";
String plaintext = "Plaintext";
String html = "<p>Hello, world.</p>";
EmailMessage email = new EmailMessage();
email.setFormat(EmailFormat.MULTIPART);
email.setSender(new EmailAddress("Example Sender", "sender@example.com"));
email.setRecipients(new EmailAddress("Example Recipient", "recipient@example.com"));
email.setReplyTo(new EmailAddress("Example Reply", "reply@example.com"));
email.setSubject(subject);
email.setPlaintext(plaintext);
email.setHtml(html);
InternetAddress sender = new GaeEmailUtils().createInternetAddress("sender@example.com", "Example Sender");
InternetAddress recipient = new GaeEmailUtils().createInternetAddress("recipient@example.com", "Example Recipient");
InternetAddress replyTo = new GaeEmailUtils().createInternetAddress("reply@example.com", "Example Reply");
List<InternetAddress> recipients = new ArrayList<InternetAddress>();