Received: by m.sender.com (Postfix)
	id 5480678F; Sun, 15 Jan 2012 23:57:50 -0800 (PST)
Date: Sun, 15 Jan 2012 23:57:50 -0800 (PST)
From: MAILER-DAEMON@sender.com (Mail Delivery System)
Subject: Undelivered Mail Returned to Sender
To: bounces+12345-mango-=#43=panda.com@sender.com
Auto-Submitted: auto-replied
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
	boundary="12053783.1326700670/m.sender.com"
Message-Id: <20120116075750.5480678F@m.sender.com>

This is a MIME-encapsulated message.

--12053783.1326700670/m.sender.com
Content-Description: Notification
Content-Type: text/plain; charset=us-ascii

This is the mail system at host m.sender.com.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<mango-=#43@panda.com>: host 192.168.1.102[192.168.1.102] said: 550 5.1.1
    <mango-=#43@panda.com>: Recipient address rejected: User unknown in local
    recipient table (in reply to RCPT TO command)

--12053783.1326700670/m.sender.com
Content-Description: Delivery report
Content-Type: message/delivery-status

Reporting-MTA: dns; m.sender.com
X-Postfix-Queue-ID: 12053783
X-Postfix-Sender: rfc822; bounces+12345@sender.com
Arrival-Date: Sun, 15 Jan 2012 23:57:28 -0800 (PST)

Final-Recipient: rfc822; mango-=#43@panda.com
Original-Recipient: rfc822;mango-=#43@panda.com
Action: failed
Status: 5.1.1
Remote-MTA: dns; 192.168.1.102
Diagnostic-Code: smtp; 550 5.1.1 <mango-=#43@panda.com>: Recipient address
    rejected: User unknown in local recipient table

--12053783.1326700670/m.sender.com
Content-Description: Undelivered Message
Content-Type: message/rfc822

Return-Path: <bounces+12345@sender.com>
Received: from localhost (localhost [127.0.0.1])
	by m.sender.com (Postfix) with SMTP id 12053783
	for <mango-=#43@panda.com>; Sun, 15 Jan 2012 23:57:28 -0800 (PST)
Message-Id: <20120116075746.12053783@m.sender.com>
Date: Sun, 15 Jan 2012 23:57:28 -0800 (PST)
From: bounces+12345@sender.com

yikes

--12053783.1326700670/m.sender.com--

 ============ 
 recipient: bounces+12345-mango-=#43=panda.com@sender.com
 ============ 
 sender: MAILER-DAEMON