MSExchangeMTA Question

Have following warning message in application log:

Event Type:      Warning
Event Source:      MSExchangeMTA
Event Category:      Security
Event ID:      9297
Date:            4/6/2006
Time:            5:34:14 PM
User:            N/A
Computer:      Server1
Calling client thread does not have permission to use MTA RPCs. Windows 2000 error code: 0X80070005. Client user account: NT AUTHORITY\ANONYMOUS LOGON. [BASE IL INCOMING RPC 29 237] (14)

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Microsoft provides following only:

The operating system indicates that the user caused a security violation. The user may not have the appropriate permissions to perform this operation.
User Action
Examine the account that is causing the security violation. It is often a service account or machine account and is usually caused by:
Exchange 5.5 MTAs using the wrong service account to communicate with Exchange. Check that the 5.5 MTA service account is correct, and that it has "Send As" and "Receive As" permission on the X.400 object under "Protocols" for the server generating this error.
Exchange 2000 servers attempting to use the MTA to connect to each other with RPC when they should not. Verify directory replication and SMTP Virtual Server FQDN settings.
I don' t have have any 5.5 in admin group, only 5 server 2k3 all installed on server 2k3

Any help how to resolve this warning?
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