Subject: Returned mail: see transcript for details

From: Mail Delivery Subsystem <[email-masked]>
Date: Wed, 27 Aug 2008 04:51:29 +0600

The original message was received at Wed, 27 Aug 2008 04:51:23 +0600
from [201.54.194.41]

   ----- The following addresses had permanent fatal errors -----
<[email-masked]>
    (reason: 550 <[email-masked]>, Recipient unknown)

   ----- Transcript of session follows -----
... while talking to [192.168.1.1]:
>>> RCPT To:<[email-masked]>
<<< 550 <[email-masked]>, Recipient unknown
550 5.1.1 <[email-masked]>... User unknown