Manual:$wgEnotifMinorEdits

Details
Set to true to allow email notification for edits flagged as 'minor'.

Users still need to opt in by checking the appropriate pref>Special:MyLanguage/Help:Preferences|user preference.

User talk notifications are affected by this, $wgEnotifUserTalk, and the nominornewtalk user right.

If   is false, this setting is ignored.