有没有办法知道我的PHP脚本是否通过电子邮件发送表单？

Question

有没有办法可以验证我的PHP脚本是否可以将表单发送到电子邮件？我尝试在localhost中运行php网站并测试提交邮件，但是当我查看我的电子邮件时，没有发送任何内容。如果收到我的表格怎么办？当您通过电子邮件从php表单发送消息时，它是否立即收到？我怎么知道电子邮件脚本是错还是只是没发送？继承人我的HTML：

<div class="container">
    <div class="row">
        <div class="inquiry2 col-xs-12 col-sm-12 col-md-12 col-lg-12">
        <br></br>
        <br></br>
        <h1>Message Us</h1>
            <form action="send.php" id="frmBox" method="post" onsubmit="return formSubmit();">
                <div class="form-group">
                    <label for="InputName">Name*</label>
                    <input class="form-control" type="text" placeholder="Name" name="customer_name" id="CustomerName">
                </div>
                <div class="form-group">    
                    <label for="InputEmail">Email Address*</label>
                    <input class="form-control" type="text" placeholder="email" name="customer_email" id="CustomerEmail">
                </div>
                <div class="form-group">    
                    <label for="InputPhone">Phone*</label>
                    <input class="form-control" type="text" placeholder="phone" name="customer_phone" id="CustomerPhone">
                </div>
                <div class="form-group">    
                    <label for="InputMessage">Message*</label>
                    <textarea class="form-control" type="text" placeholder="" name="customer_message" id="CustomerMessage"></textarea>
                </div>
                <input class="btn btn-default" type="submit" value="submit">
            </form>
        </div>
    </div>
    </div>
<!--SCRIPT-->
    <script type="text/javascript" src="js/jquery-3.2.1.min.js"></script>
    <script type="text/javascript">
        function formSubmit(){
            $.ajax({
                type:'POST',
                url:'send.php',
                data:$('#frmBox').serialize(),
                success:function(response){
                    $('#success').html(response);
                }
            });
            var form=document.getElementById('frmBox').reset();
            return false;
        }
    </script>

继续发送php：

<?php 


$customer_name_error = $customer_email_error = $customer_phone_error  = "";
$customer_name = $customer_email = $customer_phone = $customer_message= $success = "";

    if ($_SERVER["REQUEST_METHOD"] == "POST") {
  if (empty($_POST["customer_name"])) {
    $customer_name_error = "Name is required";
  } else {
    $customer_name = test_input($_POST["customer_name"]);

    if (!preg_match("/^[a-zA-Z ]*$/",$customer_name_)) {
      $customer_name_error = "Only letters and white space allowed"; 
    }
  }

  if (empty($_POST["customer_email"])) {
    $customer_email_error = "Email is required";
  } else {
    $customer_email = test_input($_POST["customer_email"]);

    if (!filter_var($customer_email, FILTER_VALIDATE_EMAIL)) {
      $customer_email_error = "Invalid email format"; 
    }
  }

  if (empty($_POST["customer_phone"])) {
    $customer_phone_error = "Phone is required";
  } else {
    $customer_phone = test_input($_POST["customer_phone"]);

    if (!preg_match("/^(\d[\s-]?)?[\(\[\s-]{0,2}?\d{3}[\)\]\s-]{0,2}?\d{3}[\s-]?\d{4}$/i",$customer_phone)) {
      $customer_phone_error = "Invalid phone number"; 
    }
  }

  if (empty($_POST["customer_message"])) {
    $customer_message = "";
  } else {
    $customer_message = test_input($_POST["customer_message"]);
  }

  if ($customer_name_error == '' and $customer_email_error == '' and $customer_phone_error == '' ){
      $customer_message_body = '';
      unset($_POST['submit']);
      foreach ($_POST as $key => $value){
          $customer_message_body .=  "$key: $value\n";
      }

      $to = 'gorilyawarfare@gmail.com';
      $subject = 'Messages';
      if (mail($to, $subject, $message)){
          $success = "Message sent, thank you for contacting us!";
          $customer_name = $customer_email = $customer_phone = $customer_message = '';
      }
  }

}

function test_input($data) {
  $data = trim($data);
  $data = stripslashes($data);
  $data = htmlspecialchars($data);
  return $data;
}
?>