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Event ID: 7512 Source: MSExchangeTransport

The message with ID <message id>, P1 From <sender name>, Subject <subject> from remote host <host name> was Rejected/Deleted by the Intelligent Message Filter.
As per Microsoft: "Intelligent Message Filter writes this event when it rejects or deletes a message at the gateway.
This event is recorded only when the logging level is set to medium or maximum for the SMTP Protocol category of the MSExchangeTranport service. To set the logging level, use the Diagnostic Logging tab of the Exchange server properties". See "Monitoring and Troubleshooting Intelligent Message Filter" for more details.

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