Not receiving emails with PHP form.

        <form action="contact-process.php" method="post" name="cnt">

        <div class="form-group">

            <div class="input-group">

                    <span class="input-group-addon"><span class="glyphicon glyphicon-user form-icons"></span></span>
                    <label class="sr-only">Name</label>
                    <input class="form-control" type="text" placeholder="Name" name="name" required type="text" id="cu_name" >

            </div>

        </div>

        <div class="form-group">

            <div class="input-group">

                    <span class="input-group-addon"><span class="glyphicon glyphicon-envelope form-icons"></span></span>
                    <label class="sr-only">Email</label>
                    <input class="form-control" type="email" placeholder="Email" name="email" required id="cu_email" >

            </div>

        </div>

        <div class="form-group">

            <div class="input-group">

                    <span class="input-group-addon"><span class="glyphicon glyphicon-earphone form-icons"></span></span>
                    <label class="sr-only">Phone</label>
                    <input class="form-control" type="text" placeholder="Phone" name="phone" required  id="cu_phone">

            </div>

        </div>

        <div class="form-group">

            <div class="input-group">

                    <span class="input-group-addon"><span class="glyphicon glyphicon-pencil form-icons"></span></span>
                    <textarea class="form-control" rows="8"  placeholder="Message" name="msg" id="cu_msg"></textarea>

            </div>

        </div>

        <button type="submit" name="cu_sub" id="cu_sub" name="submit"  value="SUBMIT" class="btn btn-primary btn-lg btn-block form-btn">Submit</button>


        </form>

` ` `

This is my php code:

<?php

if ($_SERVER["REQUEST_METHOD"] == "POST") {

$toemail = "abc505@yahoo.com";
$name = $_POST["name"];
$email = $_POST["email"];
$phone = $_POST["phone"];
$msg = $_POST["msg"];
$email_body = "";
$email_body = $email_body . "Name: " . $name . "\n";
$email_body = $email_body . "Email: " . $email . "\n";
$email_body = $email_body . "Phone: " . $phone ."\n";
$email_body = $email_body . "Message: " . $msg;


//TODO: Send Email


header("Location: contact-thanks.php");
exit;
}
?>


Please help