Event ID - 2001

Event Id2001
DescriptionDeliver of message Message Tracking number@Computer Name.DNS.Org.com from Computer Name-DSA@Site.org.com in temporary file "Spool File Name" was attempted to host(s) unknown [For Remote Domain.com] with 0 recipients delivered and 1 undeliverable.
Event InformationAccording to 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.
To work around this problem, perform the following:
1. Verify that the Routing Address tab in the Connected Sites property page of the Internet Mail Connector includes the correct information.
2. Make sure the DNS entries, "A record and MX record" are correct for the Exchange sites.
Reference LinksXFOR: Event ID 4132 When Using the IMC for Directory Replication

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