h2.addField(DefaultFieldParser.parse("Content-Type: text/plain"));
p2.setHeader(h2);
p2.setBody(bodyFactory.textBody("that stuff"));
BodyPart p3 = new BodyPart();
Header h3 = new HeaderImpl();
h3.addField(DefaultFieldParser.parse("Content-Type: text/plain"));
p3.setHeader(h3);
p3.setBody(bodyFactory.textBody("all kind of stuff"));
multipart.addBodyPart(p1);
multipart.addBodyPart(p2);