Can somebody tell me why this php code to send an email isn't working?

Anybody know why this code is not working at sending me an email when i fill out the form?

<?php

include("header.php");

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

$name = trim(filter_input(INPUT_POST,"name",FILTER_SANITIZE_STRING)); $email = trim(filter_input(INPUT_POST,"email",FILTER_SANITIZE_EMAIL)); $details = trim(filter_input(INPUT_POST,"details",FILTER_SANITIZE_SPECIAL_CHARS));

if($name == "" || $email == "" || $details == ""){ echo "You must fill out all the fields in the form please go back and try again."; exit; }

require("class.phpmailer.php");

$mail = new PHPMailer;

if(!$mail->ValidateAddress($email)) { echo "Invalid Email"; exit; }

$email_body = ""; $email_body .= "Name: " . $name . "\n"; $email_body .= "Email: " . $email . "\n"; $email_body .= "Details: " . $details . "\n";

//Recipients
$mail->setFrom($email, $name);
$mail->addAddress('plathavpro@platinumhavocproductions.com', 'Plat Hav Pro');     // Add a recipient




//Content
$mail->isHTML(false);                                  // Set email format to HTML

$mail->Subject = 'Price Quote Request from' . $name;
$mail->Body    = $email_body;

if(!$mail->send()) { echo 'Message could not be sent.'; echo 'Mailer Error: ' . $mail->ErrorInfo; exit; }

header("location:pricequote.php?status=thanks"); }

if (isset($_GET["status"]) && $_GET["status"] == "thanks") { echo "<p1> Your Free Price Quote will be emailed to you within 24 hours. Thanks for inquiring with Sitespressions.</p1>"; } else { ?>

<form action="pricequote.php" method="post">

  <legend class="formtitle">Please fill out this form to see if you qualify</legend>
 <fieldset>

    <label for="name">Your name?</label>
  <input type="text" id="name" name="name">

    <label for="email">Your email?</label>      
  <input type="email" id="email" name="email">

    <label for="details">Describe the website you want built and please include who will be hosting it:</label>
  <textarea id="details" name="details"></textarea>

  <button type="submit">Get a free quote.</button>
   </fieldset>








</form>

<?php } ?>