Subject: Returned mail: see transcript for details

From: Mail Delivery Subsystem <[email-masked]>
Date: Mon, 11 Aug 2008 14:36:42 +0200 (CEST)

The original message was received at Mon, 11 Aug 2008 14:34:57 +0200 (CEST)
from [190.67.177.109]

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

   ----- Transcript of session follows -----
... while talking to mail.ision.nl.:
>>> DATA
<<< 550 <[email-masked]>: User unknown in local recipient table
550 5.1.1 <[email-masked]>... User unknown
<<< 554 Error: no valid recipients