Subject: Returned mail: see transcript for details
From: Mail Delivery Subsystem <[email-masked]>
To: <[email-masked]>
Date: Tue, 1 Aug 2006 11:02:58 -0700

The original message was received at Tue, 1 Aug 2006 11:02:54 -0700
from localhost [127.0.0.1]

   ----- The following addresses had permanent fatal errors -----
<[email-masked]>
    (reason: 550 5.7.1 No such user c18si2365148hub)

   ----- Transcript of session follows -----
... while talking to gmail-smtp-in.l.google.com.:
>>> RCPT To:<[email-masked]>
<<< 550 5.7.1 No such user c18si2365148hub
550 5.1.1 <[email-masked]>... User unknown

Subject: Test Bounce Message
From: Sender Address <[email-masked]>
To: Sender Address <[email-masked]>
Date: Tue, 1 Aug 2006 10:45:00 -0700

Plaintext here.