This is the utility I use to help view, delete, unblock, whitelist, and delete messages filtered by the Intelligent Message Filter (IMF) that is built into SP2 of Exchange 2003.

Here is a link to the website:

http://stoekenbroek.com/imfcompanion/default.htm

You can view a review of other IMF Managers at:

http://www.msexchange.org/tutorials/IMF-Managers.html

I have tried all of them, and I personally like IMF companion the most.