Mail Delivery failed: returning to sender.

[Super-User]

Subject: Mail Delivery failed: returning to sender

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  cotswold.demon.co.uk [194.222.75.186]:

MAIL FROM:<kerberos at mit.edu>
250 sender is mit.edu!kerberos
RCPT TO:<ngr at cotswold.demon.co.uk>
550 cotswold.demon.co.uk!ngr ... user unknown

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           id 1057263402:10:07710:10; Thu, 03 Jul 2003 20:16:42 GMT
 Received: from c308.oit.duke.edu ([152.3.93.208]) by punt-1.mail.demon.net
            id aa1114250; 3 Jul 2003 20:16 GMT
 From: <kerberos at mit.edu>
 To: <ngr at cotswold.demon.co.uk>
 Subject: Re: Application
 Date: Thu, 3 Jul 2003 16:15:46 --0400
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[snip - Remainder of message]