Subject: Returned mail: see transcript for details

From: Mail Delivery Subsystem <[email-masked]>
Date: Thu, 21 Aug 2008 07:04:33 +0300

The original message was received at Thu, 21 Aug 2008 07:04:30 +0300
from [123.199.89.16]

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

   ----- Transcript of session follows -----
550 5.1.1 <[email-masked]>... User unknown