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Event ID: 3161 Source: MSExchangeMTA

An internal MTA error occurred. The logon violated security. Entity name: . Error code: 0. [XAPI MAIN BASE 35 92] (14)
According to Microsoft, this is a permissions issue. See ME154298 and MSEX2K3DB for additional information about this event.
As per Microsoft: "This Event ID is logged in the Windows NT Event Viewer application log if the account listed on the Override tab of the Site Connector in the Microsoft Exchange Administrator program does not have Service Account Admin rights on the Configuration and Site containers". See ME152624 for more details.
As per Microsoft: "To resolve this issue, make sure that the Permissions pages for the organization, site, and configuration objects list the service account with the Service Account Admin role.". See the link below for more details.

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