PHP联系表格未发送到我的电子邮件

Question

我正在尝试在我的网站上创建联系表单，然后将数据发送到我的收件箱，但是，它什么也没用。请在下面查看我的代码，并让我知道我哪里出错了。当我单击表单上的提交时，我会收到成功消息，但是收件箱中没有收到该电子邮件。我在服务器上运行PHP 7.3.6版。请帮助我。

这是PHP脚本：

<?php
if(isset($_POST['email'])) {

    // EDIT THE 2 LINES BELOW AS REQUIRED
    $email_to = "justshinan99@gmail.com";
    $email_subject = "New customer inquiry - Website";

    function died($error) {
        // your error code can go here
        echo "We are very sorry, but there were error(s) found with the form you submitted. ";
        echo "These errors appear below.<br /><br />";
        echo $error."<br /><br />";
        echo "Please go back and fix these errors.<br /><br />";
        die();
    }


    // validation expected data exists
    if(!isset($_POST['name']) ||
        !isset($_POST['email']) ||
          !isset($_POST['phone']) ||
        !isset($_POST['msg'])) {
        died('We are sorry, but there appears to be a problem with the form you submitted.');       
    }



    $name = $_POST['name']; // required
    $email = $_POST['email']; // required
    $phone = $_POST['phone']; // required
     $msg = $_POST['msg']; // required


    $error_message = "";
    $email_exp = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/';

  if(!preg_match($email_exp,$email)) {
    $error_message .= 'The Email Address you entered does not appear to be valid.<br />';
  }

    $string_exp = "/^[A-Za-z .'-]+$/";

  if(!preg_match($string_exp,$name)) {
    $error_message .= 'The First Name you entered does not appear to be valid.<br />';
  }


  if(strlen($msg) < 2) {
    $error_message .= 'The Comments you entered do not appear to be valid.<br />';
  }

  if(strlen($error_message) > 0) {
    died($error_message);
  }

    $email_message = "Form details below.\n\n";


    function clean_string($string) {
      $bad = array("content-type","bcc:","to:","cc:","href");
      return str_replace($bad,"",$string);
    }



    $email_message .= "Name: ".clean_string($name)."\n";
    $email_message .= "Email: ".clean_string($email)."\n";
    $email_message .= "Phone: ".clean_string($phone)."\n";
    $email_message .= "Message: ".clean_string($msg)."\n";

// create email headers
$headers = 'From: '.$email_from."\r\n".
'Reply-To: '.$email_from."\r\n" .
'X-Mailer: PHP/' . phpversion();
@mail($email_to, $email_subject, $email_message, $headers);  
?>

<!-- include your own success html here -->

Thank you for contacting us. We will be in touch with you very soon.

<?php

}
?>

这是HTML表单：

<form action="contact.php" method="POST" >

                      <div class="row">
                        <div class="col-md-4">
                          <div class="form-group">
                            <label for="nameTwo" class="sr-only">Full name</label>
                            <input  name="name" type="text" class="form-control" required="" placeholder="First Name">
                          </div>

                          <div class="form-group">
                            <label for="emailTwo" class="sr-only">Email</label>
                            <input name ="email" type="email" class="form-control" required=""  placeholder="Email Address">
                          </div>

                          <div class="form-group">
                            <label for="phoneTwo" class="sr-only">Phone Number</label>
                            <input name ="phone" type="phone" class="form-control" required=""  placeholder="Phone Number">
                          </div>
                        </div> <!-- col-md-4 -->

                        <div class="col-md-8">
                          <div class="form-group">
                            <label for="messageTwo" class="sr-only">Message</label>
                            <textarea name="msg" class="form-control" required="" rows="7" placeholder="Write message"></textarea>
                          </div>
                        </div> <!-- col-md-8 -->
                      </div><!-- /.row-->
<input type="hidden" name="send" >
                      <button type="submit" class="btn btn-primary btn-lg pull-right">Send Message</button>
                    </form>