Transport.php

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<?php
namespace Magento\Email\Model;

use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\Exception\MailException;
use Magento\Framework\Mail\MessageInterface;
use Magento\Framework\Mail\TransportInterface;
use Magento\Framework\Phrase;
use Magento\Store\Model\ScopeInterface;
use Zend\Mail\Message;
use Zend\Mail\Transport\Sendmail;

class Transport implements TransportInterface
{
    const XML_PATH_SENDING_SET_RETURN_PATH = 'system/smtp/set_return_path';

    const XML_PATH_SENDING_RETURN_PATH_EMAIL = 'system/smtp/return_path_email';

    private $zendTransport;

    private $message;

    public function __construct(
        MessageInterface $message,
        ScopeConfigInterface $scopeConfig,
        $parameters = null
    ) {
        /* configuration of whether return path should be set or no. Possible values are:
             * 0 - no
             * 1 - yes (set value as FROM address)
             * 2 - use custom value
             * @see Magento\Config\Model\Config\Source\Yesnocustom
             */
        $isSetReturnPath = $scopeConfig->getValue(
            self::XML_PATH_SENDING_SET_RETURN_PATH,
            ScopeInterface::SCOPE_STORE
        );
        $returnPathValue = $scopeConfig->getValue(
            self::XML_PATH_SENDING_RETURN_PATH_EMAIL,
            ScopeInterface::SCOPE_STORE
        );

        if ($isSetReturnPath == '2' && $returnPathValue !== null) {
            $parameters .= ' -f' . \escapeshellarg($returnPathValue);
        }

        $this->zendTransport = new Sendmail($parameters);
        $this->message = $message;
    }

    public function sendMessage()
    {
        try {
            $this->zendTransport->send(
                Message::fromString($this->message->getRawMessage())
            );
        } catch (\Exception $e) {
            throw new MailException(new Phrase($e->getMessage()), $e);
        }
    }

    public function getMessage()
    {
        return $this->message;
    }
}