Manual:$wgEmailConfirmToEdit

From MediaWiki.org

User Access: $wgEmailConfirmToEdit
Require users to confirm email address before they can edit, true to enable.
Introduced in version:	1.6.0 (r12991)
Removed in version:	still in use
Allowed values:	boolean
Default value:	false

Other settings: Alphabetical | By Function

[edit] Details

Require users to confirm email address before they can edit, true to enable. Also, as of MediaWiki 1.12, requires people to supply an email address when registering.