Found a pretty simple way to move on Charles's idea:
$fwd = new \Zend\Mail\Message();
$fwd->setBody($message->getContent());
$h = $message->getHeaders();
$h->removeHeader('To');
$fwd->setHeaders($h);
$fwd->addTo('email@example.com');
$transport = new \Zend\Mail\Transport\Sendmail();
$transport->send($fwd);
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