可以'；t将我的php页面重定向到我的html感谢页面.我做错了什么

这是我的表单中的html代码。该文件名为interested.html

 <h1 id="title5">Write Me</h1>
     <p align="center" style="font-size:20px">If you would like to get in touch with me, please do!</p>
     <form method="post" action="contact.php">
      <fieldset>
        <input name="name" type="text" placeholder="Full Name">
        <input name="email" type="email" placeholder="Email Address">
        <textarea name="msg" placeholder="Your message..."></textarea>
      </fieldset>
      <input type="submit" class="Send">
    </form>

这是我的PHP代码。填写完表格后，我想显示我的感谢页面（send.html），而不是这个页面。此文件名为contact.php

<?php
//redirect to thank you page
//if information is not entered properly send to error page
//submit an confirmation email to me
  $name = $_POST["name"];
  $email = $_POST["email"];
  $msg = $_POST["msg"];
  echo "<pre>";
  $email_body = "";
  $email_body .= "Name " . $name . "'n";
  $email_body .= "Email " . $email . "'n";
  $email_body .= "Message " . $msg . "'n";
  echo $email_body;
  echo "</pre>";
  header("location:sent.html");
?>

请帮忙，如果我没有很好地解释我的问题，或者是否需要更多信息，请告诉我。

提前感谢！