Unable to read Diagnostic Code using MessageHeaders/InternetHeaders

Question

I'm trying to read "Diagnostic-Code" Header using the following code:
+{color:#0000ff}MessageHeaders messageHeaders=new MessageHeaders(part2.getInputStream());+
+ Enumeration iheaders=messageHeaders.getAllHeaders();+
+ while(iheaders.hasMoreElements())+
+ {+
+ Header header=(Header)iheaders.nextElement();+
+ System.out.println("InternetHeaders : "+header.getName()+": "+header.getValue());+
+ }{color}+
Message contains the following:
{color:#008000}*--nBSIUV3H002931.1262025031/**dummyserver.net*{color}
Content-Type: message/delivery-status
*{color:#0000ff}Reporting-MTA:{color} dns; dummyserver.net*
*{color:#0000ff}Received-From-MTA:{color} DNS; localhost*
*{color:#0000ff}Arrival-Date:{color} Mon, 28 Dec 2009 13:30:30 -0500 (EST)*
*{color:#ff0000}Final-Recipient: {color}RFC822; [email protected]*
*{color:#0000ff}{color:#ff0000}Action:{color}{color} failed*
*{color:#ff0000}Status: {color}5.3.0*
*{color:#ff0000}Remote-MTA:{color} DNS; dummyserver.net*
*{color:#ff0000}Diagnostic-Code:{color} SMTP; 553 5.3.0 <[email protected]>... Unknown user - sorry.*
*{color:#ff0000}Last-Attempt-Date:{color} Mon, 28 Dec 2009 13:30:31 -0500 (EST)*
*{color:#008000}--nBSIUV3H002931.1262025031/dummyserver.net
{color}*
But the above Code is able to read only the first three headers in {color:#0000ff}*blue*{color} and not the ones in *{color:#ff0000}red{color}*.
The reason seems to be the blank line which is being considered as end of headers.
Please suggest how to read "Diagnostic-Code
" without reading the stream and matching pattern.

Answer 1

Try using the DSN support included with JavaMail.
As described in [NOTES.txt|http://java.sun.com/products/javamail/NOTES.txt], add dsn.jar to your CLASSPATH.
See the javadocs for the [com.sun.mail.dsn.DeliveryStatus|http://java.sun.com/products/javamail/javadocs/com/sun/mail/dsn/DeliveryStatus.html] class.