magento2 send email programmatically without template

Magento 2: The simplest way I found to send a plain text - use Zend1 mail

    $to = ['[email protected]', '[email protected]'];
    $email = new \Zend_Mail();
    $email->setSubject("Feedback email");
    $email->setBodyText($body);
    $email->setFrom($from, $nameFrom);
    $email->addTo($to, $nameTo);
    $email->send();

You can send mail using Zend_Mail() function.

$firstname = "xxx";
$lastname = "yyyyyy";

// Send Mail functionality starts from here 
$from = "[email protected]";
$nameFrom = "From Name";
$to = "[email protected]";
$nameTo = "To Name";
$body = "
<div>
    <b>".$firstname."</b>
    <i>".$lastname."</i>
</div>";

$email = new \Zend_Mail();
$email->setSubject("Email Subject"); 
$email->setBodyHtml($body);     // use it to send html data
//$email->setBodyText($body);   // use it to send simple text data
$email->setFrom($from, $nameFrom);
$email->addTo($to, $nameTo);
$email->send();