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Event ID: 957 Source: MSExchangeTransport

Connector restrictions (by the group or by the user) are present in the organization. However, restriction checking is disabled. Set the registry value HKLM\SYSTEM\CurrentControlSet\Services\RESvc\Parameters\CheckCOnnectorRestrictions to 1 (DWORD) and restart resvc and smtpsvc to enable restriction checking on local machine.
See ME277872 to fix this problem.

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