Subject: Returned mail: see transcript for details

From: Mail Delivery Subsystem <[email-masked]>
Date: Fri, 24 Oct 2008 18:00:22 GMT

The original message was received at Fri, 24 Oct 2008 18:00:20 GMT
from [190.253.154.204]

   ----- The following addresses had permanent fatal errors -----
<[email-masked]>
    (reason: 550 Recipient not accepted (Unknown recipient: <[email-masked]>).)

   ----- Transcript of session follows -----
... while talking to [193.28.238.160]:
>>> RCPT To:<[email-masked]>
<<< 550 Recipient not accepted (Unknown recipient: <[email-masked]>).
550 5.1.1 <[email-masked]>... User unknown