If you are receiving junk emails in your hotmail mail account and and you want to block the junk email address then you can use the Hotmail Options for doing this.
To block an email address in Hotmail, click the Options menu available on the right hand side of your Inbox and select More Options from the menu list.
Navigate to the Junk e-mail section and click the Safe and blocked senders. Under the Safe and blocked senders screen, click the Blocked Senders link. You can enter the email address that needs to blocked in Blocked e-mail address or domain text field and click the Add to list button.
This would delete the messages from blocked senders automatically. You can also block a domain by entering the part of an e-mail address after the @ sign.