Subject: [Gary] Returned mail: see transcript for details

From: Mail Delivery Subsystem <[email-masked]>
Date: Wed, 9 Apr 2008 09:40:34 +0200 (MEST)

The original message was received at Wed, 9 Apr 2008 09:40:25 +0200 (MEST)
from [121.229.54.118]

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

   ----- Transcript of session follows -----
... while talking to [10.0.17.111]:
>>> DATA
<<< 550 5.1.1 User unknown
550 5.1.1 <[email-masked]>... User unknown
<<< 503 5.5.2 Need Rcpt command.