问PHP重定向表单提交不起作用

EN

    <div class="text-intro">

      <h1>Contact</h1><br><br>
      <p>To contact us please use the contact form visible. When sending files, please use the following e-mail</p><br><br><br><br><br>

      <form method="post" action="contactengine.php">

      <div class="contact-one">
        <p>
          <label for="Name">Username:</label><br><br>
          <input name="Name" id="Name" data-jkit="[validate:required=true;min=3;max=10;error=Please enter your username (3-10 characters)]">
        </p>
      </div>  

      <div class="contact-two">  
        <p>
          <label for="Email">E-mail:</label><br><br>
          <input name="Email" id="Email" data-jkit="[validate:required=true;strength=50;error=Please write your email]">
        </p>
      </div>  

      <div class="contact-three">  
        <p>
          <label for="Message">Message:</label><br><br>
          <textarea id="Message" name="Message"></textarea><br><br>

                  <input type="submit" name="submit" value="Submit" class="submit-button">
        </p>
      </div>            

        <p>
        </p>
      </form>


    </div>   

<?php

$EmailFrom = "test@gmail.com";
$EmailTo = "test2@gmail.com";
$Subject = "New message";
$Name = Trim(stripslashes($_POST['Name'])); 
$Tel = Trim(stripslashes($_POST['Tel'])); 
$Email = Trim(stripslashes($_POST['Email'])); 
$Message = Trim(stripslashes($_POST['Message'])); 



// prepare email body text
$Body = "";
$Body .= "Name: ";
$Body .= $Name;
$Body .= "\n";
$Body .= "Tel: ";
$Body .= $Tel;
$Body .= "\n";
$Body .= "Email: ";
$Body .= $Email;
$Body .= "\n";
$Body .= "Message: ";
$Body .= $Message;
$Body .= "\n";

// send email 
$success = mail($EmailTo, $Subject, $Body, "From: <$EmailFrom>");


// redirect to success page 
if ($success){
  print "<meta http-equiv=\"refresh\" content=\"0;URL=index.html\">";
}
else{
  print "<meta http-equiv=\"refresh\" content=\"0;URL=index.html\">";
}
?>