I doubt you will be able to get Hotmail to block your address. What you can do is turn your junk mail filter to Exclusive, meaning only messages from your contact list and messages originating from Hotmail Staff will arrive in your Inbox. Everything else will be sent to your junk mail folder, and will be deleted after 5 days. You won't get any notification from MSN Messenger for emails sent straight to your junk mail folder. The only thing that would be needed is making sure that your contact list stays as exclusive as you want. Be careful deleting hotmail contacts though, your hotmail contacts will include your MSN contacts.