Manual:$wgUsersNotifiedOnAllChanges

Note: before in 1.13alpha, this was misspelled $wgUsersNotifedOnAllChanges!

Details
Array of usernames who will be sent a notification email for every change which occurs on a wiki.

This capability is based on the enotif watchlist code in includes/UserMailer.php, so you must set "$wgEnotifWatchlist = true;" for this to work.