HTML 电子邮件表单不发送消息

我已经下载了一个引导程序网站模板，并正在尝试使发送到我的电子邮件地址的表单正常工作。它给出的消息是，当填写所有评论时，所有内容都已提交，但没有发送实际消息。

以下是索引中的 HTML 块：

<section id="contact">
    <div class="container">
        <div class="row">
            <div class="col-lg-12 text-center">
                <h2>Contact Us</h2>
                <hr class="star-primary">
            </div>
        </div>
        <div class="row">
            <div class="col-lg-8 col-lg-offset-2">
                <!-- To configure the contact form email address, go to mail/contact_me.php and update the email address in the PHP file on line 19. -->
                <!-- The form should work on most web servers, but if the form is not working you may need to configure your web server differently. -->
                <form name="sentMessage" id="contactForm" novalidate>
                    <div class="row control-group">
                        <div class="form-group col-xs-12 floating-label-form-group controls">
                            <label>Name</label>
                            <input type="text" class="form-control" placeholder="Name" id="name" required data-validation-required-message="Please enter your name.">
                            <p class="help-block text-danger"></p>
                        </div>
                    </div>
                    <div class="row control-group">
                        <div class="form-group col-xs-12 floating-label-form-group controls">
                            <label>Email Address</label>
                            <input type="email" class="form-control" placeholder="Email Address" id="email" required data-validation-required-message="Please enter your email address.">
                            <p class="help-block text-danger"></p>
                        </div>
                    </div>
                    <div class="row control-group">
                        <div class="form-group col-xs-12 floating-label-form-group controls">
                            <label>Phone Number</label>
                            <input type="tel" class="form-control" placeholder="Phone Number" id="phone" required data-validation-required-message="Please enter your phone number.">
                            <p class="help-block text-danger"></p>
                        </div>
                    </div>
                    <div class="row control-group">
                        <div class="form-group col-xs-12 floating-label-form-group controls">
                            <label>Message</label>
                            <textarea rows="5" class="form-control" placeholder="Message" id="message" required data-validation-required-message="Please enter a message."></textarea>
                            <p class="help-block text-danger"></p>
                        </div>
                    </div>
                    <br>
                    <div id="success"></div>
                    <div class="row">
                        <div class="form-group col-xs-12">
                            <button type="submit" class="btn btn-success btn-lg" action="public_html/mail/contact_me.php">Send</button>
                        </div>
                    </div>
                </form>
            </div>
        </div>
    </div>
</section>

下面是 PHP 文件中的代码：

<?php
// Check for empty fields
if(empty($_POST['name'])        ||
   empty($_POST['email'])       ||
   empty($_POST['phone'])       ||
   empty($_POST['message']) ||
   !filter_var($_POST['email'],FILTER_VALIDATE_EMAIL))
   {
    echo "No arguments Provided!";
    return false;
   }
$name = $_POST['name'];
$email_address = $_POST['email'];
$phone = $_POST['phone'];
$message = $_POST['message'];
// Create the email and send the message
$to = 'tri.developmentstudios@gmail.com'; // Add your email address inbetween the '' replacing            
yourname@yourdomain.com - This is where the form will send a message to.
$email_subject = "Website Contact Form:  $name";
$email_body = "You have received a new message from your website contact form.'n'n"."Here are the        
details:'n'nName: $name'n'nEmail: $email_address'n'nPhone: $phone'n'nMessage:'n$message";
$headers = "From: noreply@tri-dev.com'n"; // This is the email address the generated message will     
be from. We recommend using something like noreply@yourdomain.com.
$headers .= "Reply-To: $email_address"; 
mail($to,$email_subject,$email_body,$headers);
return true;            
?>

请帮忙！

提前谢谢你