email blocking...

Try this. Open up Exchange Server and click on Connections. Click on Internet Mail Service. Once this window opens up you will have about 11 choices to choose from. Click on Delivery Restrictions. In here you should be able to put in an address that you want to block. I think you need to have the address in your Address book to work properly though.

Good Luck

Is there a difference to you if an address is actually blocked, like with a firewall, or just deleted automatically as soon as it comes in? As far as Outlook goes, you should be able to use the rules wizard to handle certain addresses. It is calledfiltering, but if an address you add to a list comes in, you have numerous choices what you want done with it. Two choices are to delete or permanently delete it.
Hope this helps.