How to remove mail icon from indicator applet on Ubuntu 10.04

Remove a package indicator-messages.


References
http://shortrecipes.blogspot.kr/2010/04/ubuntu-1004-how-to-remove-chat-and-mail.html
http://ubuntugenius.wordpress.com/2010/05/04/remove-evolution-mail-notifier-from-indicator-applet-in-ubuntus-system-tray/