Subject: Returned mail: see transcript for details

From: Mail Delivery Subsystem <[email-masked]>
Date: Tue, 19 Aug 2008 23:57:22 +0600

The original message was received at Tue, 19 Aug 2008 23:57:19 +0600
from [85.121.66.201]

   ----- 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