Subject: Returned mail: see transcript for details

From: Mail Delivery Subsystem <[email-masked]>
Date: Wed, 27 Aug 2008 00:35:31 +0400

The original message was received at Wed, 27 Aug 2008 00:35:21 +0400
from host216.201-252-170.telecom.net.ar [201.252.170.216]

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

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