Swiftmailer未设置邮件头

我试图用Swiftmailer发送电子邮件，但它似乎没有设置邮件头？它发送正常，但电子邮件永远不会到达目的地。当我在CPanel中查看我的邮件交付报告时，收件人是未知的。所以我试着回写标题，所有的东西都是空白的。。。

这是我的密码。。。

    echo "submitting email...";
    $transport = Swift_SmtpTransport::newInstance('mail.example.com', 25)
    ->setUsername'username'
    ->setPassword('password');
    $mailer = Swift_Mailer::newInstance($transport);
    $attachment = Swift_Attachment::fromPath($_FILES['attachedfile']['tmp_name'])
    ->setFilename($name.'_'.$email);
    $message = Swift_Message::newInstance()
    ->setSubject('Submission')
    ->setFrom(array('myemail@email.com' => 'my name'))
    ->setTo(array('youremail@gmail.com' => 'your name'))
    ->setBody('Name: ' . $name . ''nEmail: ' . $email . ''nDescription: ' . $descr)
    ->attach($attachment);

    $headers =  $message->getHeaders();
foreach ($headers->getAll() as $header) {
  printf("%s<br />'n", $header->getFieldName());
}
    $failedRecipients = array();
    $result = $mailer->send($message, $failedRecipients);
if($result == 0) {
    echo "Failed sending email. Please try again later.<br/>";
} else {
    echo "Thanks for your submission!<br/>";
}