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

From: Mail Delivery Subsystem <[email-masked]>
Date: Wed, 9 Apr 2008 16:25:34 +0200

The original message was received at Wed, 9 Apr 2008 16:25:33 +0200
from uucp@localhost

   ----- The following addresses had permanent fatal errors -----
<[email-masked]>
    (reason: 550 <[email-masked]>: Recipient address rejected: User unknown in local recipient table)

   ----- Transcript of session follows -----
... while talking to [172.18.1.7]:
>>> RCPT To:<[email-masked]>
<<< 550 <[email-masked]>: Recipient address rejected: User unknown in local recipient table
550 5.1.1 <[email-masked]>... User unknown