Message::send

public function send(): MainResult
{
	global $USER;

	$checkResult = $this->checkFields();

	if (!$checkResult->isSuccess())
	{
		$result = new AddResult();
		$result->addErrors($checkResult->getErrors());
		return $result;
	}

	if ($this->checkRestrictions)
	{
		$restrictionManager = new RestrictionManager($this);
		if (!$restrictionManager->isCanSendMessage())
		{
			return (new MainResult())->addError(
				new Error(Loc::getMessage('MESSAGESERVICE_MESSAGE_ERROR_RESTRICTION'))
			);
		}
	}

	$sender = $this->getSender();
	$headers = $this->getHeaders();

	$result = InternalEntityMessageTable::add([
		'TYPE' => $this->getType(),
		'SENDER_ID' => $sender->getId(),
		'AUTHOR_ID' => $this->getAuthorId(),
		'MESSAGE_FROM' => $this->getFrom(),
		'MESSAGE_TO' => $this->getTo(),
		'MESSAGE_HEADERS' => count($headers) > 0 ? $headers : null,
		'MESSAGE_BODY' => $this->getBody(),
		'CLUSTER_GROUP' => defined('BX_CLUSTER_GROUP') ? BX_CLUSTER_GROUP : null
	]);
	if ($result->isSuccess())
	{
		$this->id = $result->getId();
		if (MainConfigOption::get('messageservice', 'event_log_message_send', 'N') === 'Y')
		{
			$userId = is_object($USER) ? $USER->getId() : 0;
			CEventLog::Log('INFO', 'MESSAGE_SEND', 'messageservice', $userId, $this->getTo());
		}
	}

	return $result;
}