MediaWiki:Prefs-help-email

Allows us to e-mail your password to you if you forget it. If you also "Enable e-mail from other users", then others can e-mail you from your User or User talk page by using the "E-mail this user" feature. Note that the sender's e-mail address will be visible to the recipient. If you change your e-mail address, you will need to reconfirm your address.