//create HTML part
if (contentsHTML_.size() > 0) {
mimeEntity = mimeRootChild.createChildEntity();
stream = currSess.createStream();
stream.writeText(join(contentsHTML_, System.getProperty("line.separator")));
mimeEntity.setContentFromText(stream, "text/html; charset=\"UTF-8\"", MIMEEntity.ENC_NONE);
stream.close();
}
//create embedded JSON part