MediaWiki:Prefs-help-email


 * You do not have to provide an e-mail address, but if you forget your password, you will not be able to regain access to your account without one. You also need to provide an email address if you wish to enable the "Email this user" feature, to either send or receive emails via Wikibooks. You can provide an email address later on, or change it. If you change your e-mail address, you will need to reconfirm it