MSN Explorer: Block messages from a specific sender
To block e-mail addresses that you don't want to receive e-mail from:
Click the Help & Settings menu, and then click Settings.
In the left pane, click E-mail.
Click Junk E-Mail Guard.
Click Blocked senders list.
In the text box above the E-mail addresses box:
To block e-mail from one sender, type the sender's e-mail address (for example, “email@example.com”).
To block an entire domain, type the domain name (for example, “example.com”).
Click Save Changes.
To help reduce junk e-mail from senders who frequently change e-mail addresses, train the MSN junk e-mail filter to delete unwanted messages automatically. For more information, see MSN Explorer: Train the junk e-mail filter.