email.setSubject("subject");
email.setTextBody("text");
MimeMessagePreparator preparator = sender.generateMimeMessagePreparator(email, "UTF-8");
MimeMessage mimeMessage = createMimeMessage();
preparator.prepare(mimeMessage);
assertEquals(1, mimeMessage.getFrom().length);
InternetAddress address = (InternetAddress)mimeMessage.getFrom()[0];
assertEquals("From", address.getPersonal());
assertEquals("from@bla.com", address.getAddress());