Hotmail is free Web email. Because it is free email, you may receive a significant number of unsolicited email advertising messages... called Spam. Unfortunately, it is almost impossible to eliminate them from any free Web email service. You can Block the email address from which a message is sent. The Option to Block is available by Clicking in the box to the left of the email message to be blocked, then Click Block above the email message list. Advertisers frequently change their addresses, therefore, it may not help eliminate Spam.