CAllMailMessage::saveForDeferredDownload

static function saveForDeferredDownload($ID, $arFields, $mailboxID)
{
	if (
		$mailboxID !== false
		&& is_set($arFields, 'BODY_HTML')
		&& $arFields['BODY_HTML'] === ''
		&& (!is_set($arFields, 'BODY') || $arFields['BODY'] === '')
		&& !$arFields['OPTIONS']['isStrippedTags']
	)
	{
		self::addDefferedDownload($mailboxID, $ID);
	}
}