Subject: Returned mail: see transcript for details

From: Mail Delivery Subsystem <[email-masked]>
Date: Wed, 27 Aug 2008 07:00:13 +0300

The original message was received at Wed, 27 Aug 2008 06:59:57 +0300
from 190-49-166-121.speedy.com.ar [190.49.166.121] (may be forged)

   ----- The following addresses had permanent fatal errors -----
<[email-masked]>
    (reason: 550 [email-masked]... No such user)

   ----- Transcript of session follows -----
... while talking to mail.zis.by.:
>>> DATA
<<< 550 [email-masked]... No such user
550 5.1.1 <[email-masked]>... User unknown
<<< 503 Issue RCPT TO: command before DATA command