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Event ID: 7515 Source: MSExchangeTransport

An error occurred while Microsoft Intelligent Message Filter attempted to filter a message with ID <message ID>, P1 From <sender>, Subject <subject>. This message will not be filtered. The error code is <error code>.
As per Microsoft: "IMF writes this event when it is unable to filter a message. Possible causes are corrupted or malformed messages". See ME907691, the link to "Monitoring and Troubleshooting Intelligent Message Filter" and MSEX2K3DB for more details.
From a newsgroup post: "Today I called MS Product Support and they said it is a bug. The IMFv2 generates this error because it can not scan messages above 3MB".

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