SenderInvitation::send

public function send(): bool
{
	if ($this->event === null || $this->context === null)
	{
		return false;
	}

	$this->checkEventOrganizer();
	$this->checkAddresserEmail();
	$this->prepareEventFields();

	$content = $this->getContent();
	if (!$content)
	{
		return true;
	}

	$status = CEvent::sendImmediate(
		self::MAIL_TEMPLATE,
		SITE_ID,
		$this->getMailEventField(),
		"Y",
		"",
		[],
		'',
		$content
	);

	return $status === Event::SEND_RESULT_SUCCESS;
}