TransportMail::send

public function send(Message\Adapter $message)
{
	$headers = $message->getConfiguration()->get('HEADERS');
	$headers = is_array($headers) ? $headers : array();
	$fields = $message->getFields();
	$preparedConsentLink = '';
	$unsubLink = $message->getUnsubTracker()->getLink();
	if (!isset($fields['UNSUBSCRIBE_LINK']))
	{
		$fields['UNSUBSCRIBE_LINK'] = $unsubLink;
	}
	if ($unsubLink)
	{
		if (!preg_match('/^http:|https:/', $unsubLink))
		{
			$unsubLink = $this->getSenderLinkProtocol() . '://' . $message->getSiteServerName() . $unsubLink;
		}
		$headers['List-Unsubscribe'] = '<'.$unsubLink.'>';
	}

	$fields['SENDER_MAIL_CHARSET'] = $message->getCharset();

	if (Integration\Bitrix24\Service::isCloud())
	{
		$headers['X-Bitrix-Mail-Count'] = $message->getTransport()->getSendCount() ?: 1;
		$recipientData = $message->getRecipientData();
		if ($recipientData['CONTACT_IS_SEND_SUCCESS'] !== 'Y')
		{
			$headers['X-Bitrix-Mail-Unverified'] = 1;
		}
	}

	$linkParameters = $message->getConfiguration()->get('LINK_PARAMS');
	if($linkParameters)
	{
		$parametersTmp = [];
		parse_str($linkParameters, $parametersTmp);
		if(is_array($parametersTmp))
		{
			$clickUriParameters = $message->getClickTracker()->getUriParameters();
			$message->getClickTracker()->setUriParameters(
				array_merge($clickUriParameters, $parametersTmp)
			);
		}
	}

	$mailAttachment = array();
	$messageAttachment = $message->getConfiguration()->get('ATTACHMENT');
	$messageAttachment = is_array($messageAttachment) ? $messageAttachment : array();
	foreach ($messageAttachment as $key => $file)
	{
		if (is_numeric($file) && $file > 0)
		{
			continue;
		}

		if (is_array($file) && File::isFileExists($file['tmp_name']))
		{
			$mailAttachment[] = array(
				'PATH' => $file['tmp_name'],
				'ID' => md5($file['tmp_name']),
				'CONTENT_TYPE' => File::getFileContents($file['tmp_name']),
				'NAME' => ($file['name'] ?: 'some_file'),
			);
		}

		unset($messageAttachment[$key]);
	}

	//set callback entity Id
	if (Integration\Bitrix24\Service::isCloud())
	{
		if ($message->getRecipientId())
		{
			$this->getMailContext()->getCallback()
				->setEntityType('rcpt')
				->setEntityId($message->getRecipientId());
		}
		else
		{
			$this->getMailContext()->getCallback()
				->setEntityType('test')
				->setEntityId(time() . '.' . rand(100, 1000));
		}
	}

	$canTrackMail = $message->getConfiguration()->get('TRACK_MAIL', $this->canTrackMails());
	$mailMessageParams = array(
		'EVENT' => [],
		'FIELDS' => $this->prepareFields($fields, $message),
		'MESSAGE' => array(
			'BODY_TYPE' => 'html',
			'EMAIL_FROM' => $this->getCleanMailAddress($message->getConfiguration()->get('EMAIL_FROM')),
			'EMAIL_TO' => '#EMAIL_TO#',
			'PRIORITY' => $message->getConfiguration()->get('PRIORITY'),
			'SUBJECT' => $message->getConfiguration()->get('SUBJECT'),
			'MESSAGE' => str_replace('#CONSENT_LINK#', $preparedConsentLink, $message->getConfiguration()->get('BODY')),
			'MESSAGE_PHP' => $message->getConfiguration()->get('BODY_PHP'),
			'FILE' => $messageAttachment
		),
		'SITE' => $message->getSiteId(),
		'CHARSET' => $message->getCharset(),
	);
	$mailMessage = Mail\EventMessageCompiler::createInstance($mailMessageParams);
	$mailMessage->compile();

	if (is_array($mailMessage->getMailAttachment()))
	{
		$mailAttachment = array_merge($mailAttachment, $mailMessage->getMailAttachment());
	}

	$mailParams = array(
		'TO' => $mailMessage->getMailTo(),
		'SUBJECT' => static::replaceTemplate($mailMessage->getMailSubject()),
		'BODY' => $mailMessage->getMailBody(),
		'HEADER' => $mailMessage->getMailHeaders() + $headers,
		'CHARSET' => $mailMessage->getMailCharset(),
		'CONTENT_TYPE' => $mailMessage->getMailContentType(),
		'MESSAGE_ID' => '',
		'ATTACHMENT' => $mailAttachment,
		'LINK_PROTOCOL' => $this->getSenderLinkProtocol(),
		'LINK_DOMAIN' => $message->getSiteServerName(),
		'TRACK_READ' => $canTrackMail ? $message->getReadTracker()->getArray() : null,
		'TRACK_CLICK' => $canTrackMail ? $message->getClickTracker()->getArray() : null,
		'CONTEXT' => $this->getMailContext(),
	);
	$linkDomain = $message->getReadTracker()->getLinkDomain();
	if ($linkDomain)
	{
		$mailParams['LINK_DOMAIN'] = $linkDomain;
	}

	// event on sending email
	$eventMailParams = $mailParams;
	$eventMailParams['MAILING_CHAIN_ID'] = $message->getConfiguration()->get('LETTER_ID');
	$event = new Main\Event('sender', 'OnPostingSendRecipientEmail', [$eventMailParams]);
	$event->send();
	foreach ($event->getResults() as $eventResult)
	{
		if($eventResult->getType() == Main\EventResult::ERROR)
		{
			return false;
		}

		if(is_array($eventResult->getParameters()))
		{
			$eventMailParams = array_merge($eventMailParams, $eventResult->getParameters());
		}
	}
	unset($eventMailParams['MAILING_CHAIN_ID']);
	$mailParams = $eventMailParams;

	return Mail\Mail::send($mailParams);
}