IMF is the built in spam filter included with Exchange Server 2003 SP2.  It is quite a powerful tool but there are times when you may want to exclude a user or users from filtering.  Microsoft has published a hotfix under KB 912587, which, once applied, will allow you to exclude a user from IMF.

Once the hotfix is installed you have a little configuration to do on the Exchange server itself.

Open up the registry and drill down to

HKLM\Software\Microsoft\Exchange

Create the a new key called ContentFilter and under this key create a REG_DWORD called CheckRecipients and set the value to 2.  Next create a Multi-string Value called RecipList and enter the names to be excluded seperated by a semi colon (;).  Reboot.  You should be aware the with a message going to multiple recipients if even just one is not on the excluded list, the message will get scanned.

Alternatively you could set CheckRecipients to 2 and add the names that you want included in IMF scanning to the list and ignore all others.