I think the bounce back message you refer to should be the below message. It's attached as a text file in the "Delivery Status Notification" message. I posted several recent bounce back messages for your reference.
Reporting-MTA: dns;blu0-omc4-s22.blu0.hotmail.com
Received-From-MTA: dns;BLU168-DS20
Arrival-Date: Mon, 19 Mar 2012 19:11:05 -0700
Final-Recipient: rfc822;*** Email address is removed for privacy ***
Action: delayed
Status: 4.4.7
Will-Retry-Until: Wed, 21 Mar 2012 19:10:05 -0700
Reporting-MTA: dns;blu0-omc4-s12.blu0.hotmail.com
Received-From-MTA: dns;BLU168-DS35
Arrival-Date: Mon, 19 Mar 2012 08:20:55 -0700
Final-Recipient: rfc822;*** Email address is removed for privacy ***
Action: delayed
Status: 4.4.7
Will-Retry-Until: Wed, 21 Mar 2012 08:19:34 -0700
Reporting-MTA: dns;blu0-omc4-s18.blu0.hotmail.com
Received-From-MTA: dns;BLU168-DS37
Arrival-Date: Mon, 19 Mar 2012 08:19:48 -0700
Final-Recipient: rfc822;*** Email address is removed for privacy ***
Action: delayed
Status: 4.4.7
Will-Retry-Until: Wed, 21 Mar 2012 08:18:36 -0700
Reporting-MTA: dns;blu0-omc4-s22.blu0.hotmail.com
Received-From-MTA: dns;BLU168-DS34
Arrival-Date: Sun, 18 Mar 2012 22:15:53 -0700
Final-Recipient: rfc822;*** Email address is removed for privacy ***
Action: delayed
Status: 4.4.7
Will-Retry-Until: Tue, 20 Mar 2012 22:14:56 -0700