bitrix d7 'mail event'

mail.event.php

<?php
use Bitrix\Main\Application;
use Bitrix\Main\Mail\Event;

$context = Application::getInstance()->getContext();

// if need file attach
$strUploadDir = $_SERVER['DOCUMENT_ROOT'] . '/upload/';
$strUploadFile = $strUploadDir . basename($arFile['name']);

$arMailFields = array(
    'EVENT_NAME' => 'NEW_USER_NOTICE',
    'LID' => $context->getSite(),
    'C_FIELDS' => array(
        'NAME' => $arClient['name'],
        'EMAIL' => $arClient['email'],
        'PASSWORD' => $strPasswd
    ),
    'FILE' => array(
        $strUploadFile  // full path to file
    )
);

$result = Event::send($arMailFields);

if (!$result->isSuccess()) {
    print_r($result->getErrorMessages());
}