Emails headers with swiftmailer and Symfony 2
$message = Swift_Message::newInstance()
        ->setSubject('Hello Email')
        ->setFrom(array('digest@mydomain.com' => "Digest"))
        ->setSender(array('digest@mydomain.com' => "Digest"))
        ->setCharset('iso-8859-1')
        ->setContentType('text/html')
        ->setTo('myemail@gmail.com')
        ->setBody($this->renderView('email.html.twig', array()));

$this->get('mailer')->send($message);

mailer_transport: gmail
mailer_user: myemail@gmail.com
mailer_password: ******