private MessageServiceFactory newMessageBuilder() throws MimeException {
MimeConfig mec = new MimeConfig();
mec.setMaxLineLen(10000);
mec.setMaxHeaderLen(30000);
MessageServiceFactory mbf = MessageServiceFactory.newInstance();
mbf.setAttribute("MimeEntityConfig", mec);
mbf.setAttribute("FlatMode", true);
mbf.setAttribute("ContentDecoding", false);
return mbf;
}