Problem sending smtp Swift_Message with Symfony2

Hello, I have a problem when I use SMTP with Swift_Message.

I put the information right and the email arrives. The problem is that an email arrives for both "From" and "To". Is this normal or do I have to set something up so it does not?

I'm going to put the code made with Symfony2 that, despite being a framework, you can understand what is being done.

$transport = \Swift_SmtpTransport::newInstance($host, $port, $security)
    ->setUsername($login)
    ->setPassword($senha)
    ->setAuthMode('login');

    $mailer = \Swift_Mailer::newInstance($transport);

    $message = \Swift_Message::newInstance()
        ->setSubject($titulo)
        ->setFrom($from)
        ->setTo($para)
        ->setBody(
            $conteudo,
            'text/html'
        );

    $mailer->send($message);