|Message:||The account ‘%1’ provided valid credentials, but is not authorized to use the server; failing authentication.|
This Warning event indicates that the specified account is authorized to use the Receive connector to accept inbound messages, but the account is not authorized to use the Microsoft Exchange Server 2007 Hub Transport server or Edge Transport server that contains the Receive connector. The specified account requires the MS-Exch-SMTP-Submit permission to submit inbound messages by using a Receive connector.
Receive connectors use permission groups to define the entities that can submit messages to the Receive connector and the permissions that are assigned to those groups. A permission group is a predefined set of permissions that is granted to well-known security principals and assigned to a Receive connector. Security principals include users, computers, and security groups.
The set of permission groups is predefined in Exchange 2007. This means that you cannot create additional permission groups. Also, you cannot modify the permission group members or the associated permissions. For a complete description of the permission groups and the associated security principals, see Receive Connectors.
To resolve this warning, verify that the account that is specified in the event text has the MS-Exch-SMTP-Submit permission assigned to it on the appropriate Receive connectors on the Hub Transport server or Edge Transport server.
If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.