You can allow users to have different levels of e-mail notification privileges, allowing the user to specify whether or not they will receive e-mail notifications when they receive work items. To configure e-mail notification at the user level:
Open the User editor for a user and click the E-mail tab.
Select the Notify by e-mail checkbox to enable e-mail notification for the user.
Select the User can change setting checkbox to enable the user to change their e-mail notification option.
Do one of the following to add e-mail addresses for the user:
Right-click in the e-mail table, and then click Add in the shortcut menu.
In the User menu, click Add E-mail Address.
Type an e-mail address, and then click OK.
Click Apply to save the changes.