联系表格问题

Question

我有一个非常简单（我认为）的联系表格 - 一切都有效，但我没有收到任何邮件。这是php：

<?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 = 'youremail@email.com'; // I've replaced youremail with my proper email here
$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: Lloyd\n";
$headers .= "Reply-To: $email_address"; 
mail($to,$email_subject,$email_body,$headers);
return true;            
?>

这是CSS：

     <div class="row contact-wrap"> 
            <form name="sentMessage" id="contactForm" novalidate>
                    <div class="row control-group">
                        <div class="form-group col-xs-6 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-6 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-6 floating-label-form-group controls">
                            <label>Phone Number</label>
                            <input type="number" class="form-control" placeholder="Phone Number" id="phone">
                            <p class="help-block text-danger"></p>
                        </div>
                    </div>

                    <div class="row control-group">
                        <div class="form-group col-xs-6 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">

                                <p><em>* Required fields</em></p>

                                    <button type="submit" class="btn btn-success btn-lg">Sumbit</button>
                            </div>
                        </div>
                </form>


        </div>

我已经将正确的脚本放在底部，CSS链接到标题中。我是新手联系表格，所以我并不感到惊讶，这不起作用，但我已经在不同的网站上使用它，它的工作正常。