Subject: Mail delivery failed

From: Mail Delivery System <[email-masked]>
Date: Sun, 16 Mar 2008 01:37:18 -0600

This message was created automatically by mail delivery software.

A message that you have sent could not be delivered to one or more
recipients.  This is a permanent error.  The following address failed:

  <[email-masked]>: 550 5.1.1 User unknown

Included is a copy of the message header:
-----------------------------------------
To: <[email-masked]>
Subject: RE: Discount. Coupon #pqzst
From: <[email-masked]>