Subject: Returned mail: see transcript for details

From: [email-masked] (Mail Delivery Subsystem)
Date: Wed, 24 Sep 2008 14:28:14 +1200

The original message was received at Wed, 24 Sep 2008 14:27:45 +1200
from [222.78.202.146]

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

   ----- Transcript of session follows -----
... while talking to corpmail.tts.magadan.su.:
>>> DATA
<<< 550 [email-masked] unknown user account
550 5.1.1 <[email-masked]>... User unknown
<<< 554 no valid RCPT address specified