Почему не работает мой код для отправки заявки на почту?

Html

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>getmarkets</title>
	<link rel="stylesheet" href="css/style.css">
</head>
<script src="http://yandex.st/jquery/1.9.1/jquery.js"></script>
<script>
function send_form() { 
var msg = $("#forma").serialize();
$.ajax({
type: "POST",
url: "php/main.php",
data: msg,
success: function(data) {
alert("Сообщение отправлено");
setTimeout(function () {
$(".feedback_form_bg").fadeOut();}, 1000);
},
error:  function(xhr, str){
alert("Возникла ошибка!");
setTimeout(function () {$(".feedback_form_bg").fadeOut();}, 1000);
}
});
}
</script>
<body>
	<section class="applications">
		<div class="container">
			<div class="logo">
				<img src="icons/logo.png" alt="">
			</div>
			<div class="wrap">
				<h1>Ремонтные <span>работы</span></h1>
				<form method="post" action="javascript:void(0);" onsubmit="send_form();" id="forma">
					<input id="applications_first_input" type="text" name="fio" placeholder="Ф.И.О"/>
					<input type="text" name="phone" placeholder="Телефон" />
					<input type="text" name="email" placeholder="E-Mail" />
					<input class="send" type="submit" value="отправить" />
				</form>
			</div>
		</div>
	</section>
</body>
</html>

PHP

<?php
$fio= $_POST['fio'];
$phone= $_POST['phone'];
$email= $_POST['email'];
$emailTo = 'getmarkets@yandex.ru'; 
$body = "$fio \n\n$phone\n\n$email";
$headers = "Content-Type: text/plain; charset=utf-8\r\n".'From: MySite <'.$emailTo.'>' . "\r\n" . 'Reply-To: ' . $emailTo;
mail($emailTo, $fio, $body, $headers);
$emailSent = true;
?>

Фото расположения файлов

CSS

* {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}

:active, :hover, :focus {
    outline: 0;
    outline-offset: 0;
}

input:focus::-webkit-input-placeholder { color:transparent; }
input:focus:-moz-placeholder { color:transparent; } /* FF 4-18 */
input:focus::-moz-placeholder { color:transparent; } /* FF 19+ */
input:focus:-ms-input-placeholder { color:transparent; } /* IE 10+ */

.applications{
	background: url(../img/bg/1.png) center center/cover no-repeat;
	height: 750px;
}

.container{
	margin: 0 auto;
	width: 1140px;
}

.applications{
	padding-top: 10px;
	padding-left: 7px;
}

.applications h1{
	font-size: 75px;
	margin-bottom: 20px;
}

.applications h1 span{
	display: block;
}


.applications .wrap{
	padding-top: 210px;
	padding-left: 50px;
	display: inline-block;
}

.applications form{
	width: 160px;	
	height: 313px;
	border-radius: 1000px;
	text-align: center;
	margin-left: 30px;
	margin: 0 auto;
}


#applications_first_input{
	margin-top: 0px;
}

.applications input{
	display: block;
	margin: 0 auto;
	margin-top: 5px;
	background: #e9eff8;
	border: 0;
	border-radius: 100px;
	height: 50px;
	border: 1px solid #ff753a;
	text-align: center;
}

.applications .send{	
	background: #ff9d71;
	width: 115px;
}