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Event ID: 1033 Source: MSExchangeMTA

Source
Level
Description
A connection attempt from entity /o=<site name>/ou=<OU name>/cn=Configuration/cn=Servers/cn=<server name> was refused due to security violation. Check to ensure that this entity has the appropriate "Send As" permissions on the local servers X400 object. [PLATFORM MAIN BASE 1 30] (14).
Comments
 
As per Microsoft: "This warning message indicates a permissions problem. This may typically be seen in multiple domain scenarios where there are Exchange Servers in separate domains and a Site Connector links the two sites". See MSEX2K3DB for additional information about this event.

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