Subject: Returned mail: see transcript for details

From: Mail Delivery Subsystem <[email-masked]>
Date: Thu, 4 Sep 2008 08:46:11 +0300 (EEST)

The original message was received at Thu, 4 Sep 2008 08:46:10 +0300 (EEST)
from [118.176.70.59]

   ----- The following addresses had permanent fatal errors -----
<[email-masked]>
    (reason: 550 5.1.1 <[email-masked]>... User unknown)
    (expanded from: <[email-masked]>)

   ----- Transcript of session follows -----
... while talking to pubsrv1.di.uoa.gr.:
>>> DATA
<<< 550 5.1.1 <[email-masked]>... User unknown
550 5.1.1 <[email-masked]>... User unknown
<<< 503 5.0.0 Need RCPT (recipient)