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no object DCH for MIME type multipart/mixed 
Caused by: javax.activation.UnsupportedDataTypeException: no object DCH for MIME type multipart/related; 
 boundary="----=_Part_0_9042915.1299319807397"
 at javax.activation.ObjectDataContentHandler.writeTo(Unknown Source)
 at javax.activation.DataHandler.writeTo(Unknown Source)
 at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:1383)
 at javax.mail.internet.MimeMessage.writeTo(MimeMessage.java:1743)
 at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:888)
 ... 4 more
There is something wrong with MailCap, javamail can not find a handler for such multipart/mixed part.
And the solution is add mime programmingly: 
MailcapCommandMap mc = (MailcapCommandMap) CommandMap.getDefaultCommandMap();
mc.addMailcap("text/html;; x-java-content-handler=com.sun.mail.handlers.text_html");
mc.addMailcap("text/xml;; x-java-content-handler=com.sun.mail.handlers.text_xml");
mc.addMailcap("text/plain;; x-java-content-handler=com.sun.mail.handlers.text_plain");
mc.addMailcap("multipart/*;; x-java-content-handler=com.sun.mail.handlers.multipart_mixed");
mc.addMailcap("message/rfc822;; x-java-content-handler=com.sun.mail.handlers.message_rfc822");
CommandMap.setDefaultCommandMap(mc);