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Event ID: 2006 Source: MSExchangeIMC

Source
Level
Description
Can't resolve the host <unknown> (for <domain name>) in order to deliver one or more messages.
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.
This can be due to an invalid domain entered on the email address. For example, a sender may have typed "john.doe@htomail.com" instead of "john.doe@hotmail.com". The solution is to enter the correct domain.

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