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

From: Mail Delivery Subsystem <[email-masked]>
Date: Fri, 11 Apr 2008 10:59:05 +0400

The original message was received at Wed, 9 Apr 2008 13:26:04 +0400
from dslb-088-066-055-218.pools.arcor-ip.net [88.66.55.218]

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

   ----- Transcript of session follows -----
... while talking to [10.0.0.2]:
>>> DATA
<<< 550 5.1.1 <[email-masked]>... User unknown
550 5.1.1 <[email-masked]>... User unknown
<<< 503 5.0.0 Need RCPT (recipient)