Microsoft – Exchange 2003 SP2 – Intelligent message filtering v2 – deleting Sharepoint services notifications on the same machine!!! Can be resolved using MIN and MSExchange.UceContentFilter.xml described in the article below.
http://www.msexchange.org/tutorials/Intelligent-Message-Filter-version-2-IMF-v2.html

Microsoft – Exchange 2003 SP2 – Intelligent message filtering v2 – Exclude …
http://support.microsoft.com/?id=912587