what does this mean?

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Autor: Neal Becker
Data:  
Para: exim-users
Asunto: what does this mean?
What does this message mean?

1996-09-13 09:33:56 0v1YNY-0004fW-00 rejected from kant.trans.comsat.com [192.30.247.7]: unknown local-part in sender <kant!Eric.Timmons@???>