A non-delivery report with a status code of 5.6.3

A non-delivery report with a status code of 5.6.3 was generated for recipient name@mycompany.com... , any ideas what this means
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CompassITAsked:
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amaheshwariCommented:
Hi,

For Numeric Code: 5.6.3 in MSarticle it is suggested that user is sending more than 250 attchments or header has problem.Please check this :

http://support.microsoft.com/?kbid=284204 

Thanks
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