WARNING – WP 4.3 and automatic email notifications!

Oh thanks I would use it in the new version, I have just read it in the core.

if ( isset( $userdata['user_email'] ) && $user['user_email'] !== $userdata['user_email'] ) {
		/**
		 * Filter whether to send the email change email.
		 *
		 * @since 4.3.0
		 *
		 * @see wp_insert_user() For <code>$user</code> and <code>$userdata</code> fields.
		 *
		 * @param bool  $send     Whether to send the email.
		 * @param array $user     The original user array.
		 * @param array $userdata The updated user array.
		 *
		 */
		$send_email_change_email = apply_filters( 'send_email_change_email', true, $user, $userdata );
	}

Thanks!!!