OnSaleOrderSaved Handler

init.php

function my_OnSaleOrderSaved(Main\Event $event){
    $order = $event->getParameter('ENTITY');
    $isNew = $event->getParameter('IS_NEW');

    $propsCollection = $order->getPropertyCollection();

    if($isNew){
        $out = '';
        $arProps = array();
        foreach($propsCollection->getGroupProperties(1) as $prop){
            $propValue = $prop->getValue();
            $p = $prop->getProperty();
            $arProps[$p['CODE']] = $propValue;
        }

        $basket = $order->getBasket()->getBasketItems();

        $arItems = array();
        foreach ($basket as $item){
            $qtty = $item->formatQuantity($item->getQuantity());
            $price = $item->getPrice();
            $name = $item->getField('NAME');
            $arItems[] = array(
                'NAME' => $name,
                'QUANTITY' => $qtty,
                'PRICE' => CurrencyFormat($price,'RUB'),
            );
        }

        $basket_html = '';
        foreach ($arItems as $arItem){
            $basket_html .= $arItem['NAME'].' - '.$arItem['QUANTITY'].' x '.$arItem['PRICE']."<br>";
        }

        $arFields = array(
            'ORDER_ID' => $order->getId(),
            'ORDER_DATE' => $order->getDateInsert(),
            'PRICE' => CurrencyFormat($order->getPrice(),'RUB'),
            'ORDER_LIST' => $basket_html,
            'DESCRIPTION' => $order->getField('USER_DESCRIPTION'),
        );

        $arFields = array_merge($arFields,$arProps);

        \Bitrix\Main\Mail\Event::send(array(
            "EVENT_NAME" => "SALE_NEW_ORDER_ADMIN",
            "LID" => "s1",
            "C_FIELDS" => $arFields
        ));
    }
}

before 10 better:
foreach ($propsCollection->getGroups() as $group)
{
foreach($propsCollection->getGroupProperties($group["ID"]) as $prop){