Subject: Returned mail: see transcript for details

From: Mail Delivery Subsystem <[email-masked]>
Date: Sun, 1 Feb 2009 00:23:11 +0100

The original message was received at Sun, 1 Feb 2009 00:23:10 +0100
from [88.228.109.17]

   ----- The following addresses had permanent fatal errors -----
<[email-masked]>
    (reason: 553 5.1.6 <[email-masked]>... Unknown LMS mailbox)

   ----- Transcript of session follows -----
... while talking to [10.13.111.68]:
>>> DATA
<<< 553 5.1.6 <[email-masked]>... Unknown LMS mailbox
550 5.1.1 <[email-masked]>... User unknown
<<< 503 5.0.0 Need RCPT (recipient)