If you are using an Active Directory tool such as Ldp.exe, and the entry for the Microsoft Exchange 2000 Server message transfer agent (MTA) is deleted, an attempt to start the MTA on the particular server causes following error to be recorded in the application event logs on the server:
Source: MSExchangeMTA
Category: Field Engineering
Type: Error
Event ID: 9405
Description: An unexpected error has occurred which may cause the MTA to terminate. Error: Init Routing API returned error -1073478766. [BASE MAIN BASE 1] (16)
The following is an example of an entry for the MTA:
CN=Microsoft MTA,CN=servername,CN=Servers,CN=First Administrative Group,CN=Administrative Groups,
CN=OrgName,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=DomainName,DC=microsoft,DC=com
NOTE: The above entry has been wrapped for readability purposes and represents the Distinguished Name (DN) for the MTA.