+add_action( 'wpmu_activate_user', 'wpmu_welcome_user_notification', 10, 3 );
+add_action( 'after_signup_user', 'wpmu_signup_user_notification', 10, 4 );
+add_action( 'network_site_new_created_user', 'wp_send_new_user_notifications' );
+add_action( 'network_site_users_created_user', 'wp_send_new_user_notifications' );
+add_action( 'network_user_new_created_user', 'wp_send_new_user_notifications' );