Subject: Returned mail: see transcript for details

From: Mail Delivery Subsystem <[email-masked]>
Date: Tue, 26 Aug 2008 13:59:37 +0300

The original message was received at Tue, 26 Aug 2008 13:59:33 +0300
from metronet72.st.metrocarnet.carnet.hr [193.198.165.72]

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

   ----- Transcript of session follows -----
mail.local: unknown name: defen
550 5.1.1 <[email-masked]>... User unknown