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Event ID: 2001 Source: MSExchangeIMC

Source
Level
Description
Delivery of message <Message ID> from USER in temporary file <file name> was attempted to host(s) IP Address (for Domain) with X recipients delivered and X undeliverable.
Comments
 
As per Microsoft: "One possible cause may be incorrect information in the Routing Address tab of the Connected Sites property page of the Internet Mail Connector. These errors may also be logged when the Internet Mail Connector is not able to resolve the remote Internet Mail Connector domain name or IP address. You should try verifying entries in DNS Manager". See ME185108 for more details.
If diagnostic logging is enabled for the Internet Mail Service, this event will be generated each time the IMC attempts to deliver a message to a remote host.

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