Subject: Returned mail: see transcript for details

From: Mail Delivery Subsystem <[email-masked]>
Date: Tue, 26 Aug 2008 21:15:35 +0300

The original message was received at Tue, 26 Aug 2008 21:15:31 +0300
from [211.110.86.66]

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

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