Subject: Returned mail: see transcript for details

From: Mail Delivery Subsystem <[email-masked]>
Date: Wed, 15 Oct 2008 03:04:46 +0300

The original message was received at Wed, 15 Oct 2008 03:03:59 +0300
from 189.26.242.4.host.gvt.net.br [189.26.242.4] (may be forged)

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

   ----- Transcript of session follows -----
... while talking to mail.sevstar.net.:
>>> RCPT To:<[email-masked]>
<<< 550 [email-masked] unknown user account
550 5.1.1 <[email-masked]>... User unknown