 providing multipart handlers from the
 Jakarta Mail API. Lacking these additional MimeMultipart subclasses,
 all subtypes of MIME multipart data appear as MimeMultipart objects. <p>

 An application can directly construct a MIME multipart object of any
 subtype by using the <code>MimeMultipart(String subtype)</code>
 constructor.  For example, to create a "multipart/alternative" object,
 use <code>new MimeMultipart("alternative")</code>. <p>

 The <code>mail.mime.multipart.ignoremissingendboundary</code>
 