NIS 2010 - Spam filter problems

I am using Outlook Express 6 with NIS' spam filter.

 

When I try to block a spam message that made it to my Inbox, I am asked if I want to block the email address. The problem is the address is mine, even though the From field shows some made up name like Viagra Sales or whatever other name a spammer can come up with.

 

Before upgrading from NIS 2009 to NIS 2010 about 2 weeks ago, almost all of these messages were correctly categorized as spam and automatically sent to the spam folder. Now most of these messages come through to my inbox.

 

Any tips or thoughts?