<?php
namespace Hevelop\Example\Console\Command;
use Symfony\Component\Console\Command\Command;
use Magento\Framework\Mail\TransportInterfaceFactory;

/**
 * Class SendMailWithoutTemplate
 */
class SendMailWithoutTemplate extends Command
{
    /**
     * @var TransportInterfaceFactory
     */
    protected $mailTransportFactory;

    /**
     * @param ResourceConnection $dbConnection
     * @throws \LogicException
     */
    public function __construct(
        TransportInterfaceFactory $mailTransportFactory
    )
    {
        $this->mailTransportFactory = $mailTransportFactory;
        parent::__construct();
    }

    /**
     * Configures the current command.
     * @throws \InvalidArgumentException
     */
    protected function configure()
    {
        $this->setName('example:sendmail')
            ->setDescription('Send a simple mail');
        parent::configure();
    }

    public function execute()
    {
        $message = new \Magento\Framework\Mail\Message();
        $message->setFrom('mail.recipient@example.com');
        $message->addTo('mail.tosent@example.com');
        $message->setSubject('Subject');
        $message->setBody('Body');
        $transport = $this->mailTransportFactory->create(['message' => $message]);
        $transport->sendMessage();
    }
}