You may want to wait a few days because I think Andy is re-writing some of the code to handle MIME messages.

I'm looking forward to checking out Andy's code as well.

I the mean time, here's what I'm doing - even if it's not pretty, it does work! (I know there are known "problems" with javax.mail, but for the time being we can view messages.)

Sorry, I can't post the complete code for some of the stuff we're doing, but I think this is good enough for a starting point!

You need to get the sender mbean doing something like this:
(There are examples in the JBCS code to see a complete example.)

private String chainName = "jboss.mail:type=MailServices,name=MailSender";
sender = (MailSender) JBMailJMXUtil.getMBean(chainName, MailSender.class);

MailboxService mbs = this.sender.getMailboxManager();

ByteArrayOutputStream out = new ByteArrayOutputStream();
this.writeMessage(out, message, mbs);
ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
String cte = message.getHeader("Content-Transfer-Encoding");
MimeMessage mimeMessage = createMimeMessage(cte, in);

private MimeMessage createMimeMessage(String cte, InputStream in) {
 Properties props = new Properties();
 Session session = Session.getInstance(props);
 MimeMessage mimeMessage = null;
 if (cte != null) {
 cte = cte.trim();
 log.debug("Decoding CTE as: " + cte);
 try {
 InputStream decodeIs = MimeUtility.decode(in, cte);
 mimeMessage = new MimeMessage(session, decodeIs);
 decodeIs.close();
 } catch (Exception e) {
 log.debug("Error creating MIME message. " + e.getMessage());
 }
 } else {
 try {
 mimeMessage = new MimeMessage(session, in);
 } catch (Exception e) {
 log.debug("Error creating MIME message. " + e.getMessage());
 }
 }
 return mimeMessage;
}