Unable to add sender to Blocked Sender list in OWA

Intersting problem here.  I have a user that gets the following error message when he tries to add a sender to his blocked senders list in OWA:

"an error occurred processing your junk e-mail lists. You are over the size limit allowed on the server."

We do not have any limits setup on the server making this error message more baffling. Furthermore, when he switched to Outlook 2003, he's able to add that sender to the blocked senders list.

We are running Exchange 2003 on Windows 2003.  
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SembeeConnect With a Mentor Commented:
The limit isn't in the Exchange server itself. This is a limit within Exchange/Outlook communications. It is the same limit that affects rules in conventional Outlook.
This limit cannot be changed unless you have Exchange 2003 SP1 installed on your server - this introduces a registry hack where the limit can be increased.

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