File Screening in windows R2

Hi all,

We have set up a File server in our domain using Windows 2003 R2 and I would like to take advantage of the new File Screening app.  We have configured the SMTP settings and the test email works ok,  set up the filter for passive screening and to email me when an event takes place. but when we add a file that would set of the passive filter I get the following error in the Event Log. It also logs the filter event ok.

File Server Resource Manager Service error: Unexpected error.

Operation:
   Running email action.
   Handling a file screen audit event.
   Processing File Server Resource Manager event

Context:
   Action type: Email Action
   Action name: Email Action0
   SMTP server: 192.168.1.49
   Mail-from address: FSRM@cats-solutions.co.uk
   Mail-reply-to address: FSRM@cats-solutions.co.uk
   Mail-to address: support@cats-solutions.co.uk
   Mail-CC address:
   Mail-BCC address:
   Mail subject: Unauthorized file from the "Audio and Video Files" file group detected
   Mail message text: User CATS-SOLUTIONS\darren.whitfield attempted to save C:\Network Data\Utilities\Copy (2) of Copy of test.wma to C:\Network Data\Utilities on the CATSINT01 server. This file is in the "Audio and Video Files" file group, which is not permitted on the server.
   File screen path: C:\Network Data\Utilities

Error-specific details:
   Error: IMessage::Send, 0x80040211

We have a 2003 domain with Exchange 2003 Ent,

Any help would be appreciated