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Event ID: 756 Source: MSExchangeTransport

Level
Description
A non-delivery report with a status code of 5.1.1 was generated for recipient rfc822;<email address> (Message-ID <SRVER01eVwrblZz00000003b@ABC.xyz.com>).
Comments
 
See ME308323 and ME817425 for information on how to fix this issue.

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