Manual:$wgEmailConfirmToEdit

Details
Require users to confirm their email address before they can edit, true to enable.

Also, as of MediaWiki 1.12, requires people to supply an email address when registering.


 * As a result, this disables anonymous editing from IP addresses, since unregistered users cannot have confirmed email addresses.
 * This configuration parameter is being ignored in case configuration parameter ​ is set to " ".