issue using PHPMailer alway display "Invalid Email Address"

<?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));
$category = trim(filter_input(INPUT_POST,"category",FILTER_SANITIZE_STRING));
$title = trim(filter_input(INPUT_POST,"title",FILTER_SANITIZE_STRING));
$format = trim(filter_input(INPUT_POST,"format",FILTER_SANITIZE_STRING));
$genre = trim(filter_input(INPUT_POST,"genre",FILTER_SANITIZE_STRING));
$year = trim(filter_input(INPUT_POST,"year",FILTER_SANITIZE_STRING));  
$details = trim(filter_input(INPUT_POST,"details",FILTER_SANITIZE_SPECIAL_CHARS));

  if(!isset($error_message) && ($name == "" || $email == "" || $category=="" || $title=="")){
      $error_message ="Please fill in the required fields: Name, Email, Title and Category";

  }
  if (!isset($error_message) && $_POST["address"] != "") {
    $error_message = "Bad form input";

  }

  require("inc/phpmailer/class.phpmailer.php");

$mail = new PHPMailer;
if( $mail ->ValidateAddress($email)){
 $error_message = "Invalid Email Address";
}


if(!isset($error_message)){
      $email_body = "";
      $email_body.= "Name ".$name. "\n";
      $email_body.= "Suggest Item\n";
      $email_body.= "Category ".$category. "\n";
      $email_body.= "Title ".$title. "\n";
      $email_body.= "Format ".$format. "\n";
      $email_body.= "Genre ".$Genre. "\n";
      $email_body.= "year ".$email. "\n";
      $email_body.= "Email ".$email. "\n";
      $email_body.= "Details ".$details. "\n";

       $mail->setFrom($email, $name);
      $mail->addAddress('treehouse@localhost', 'Alena');     // Add a recipient


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

      $mail->Subject = 'Here is the subject';
      $mail->Body    = $email_body;


      if($mail->send()) {
           header("location:suggest.php?status=thanks");
      }
          $error_message = 'Message could not be sent.';
          $error_message .= 'Mailer Error: ' . $mail->ErrorInfo;



   } 

//To Do: Send Email

}

$pageTitle = "Suggest a Media Item";
$section = "suggest";

include("inc/header.php"); 


?>

<div class="section page">
  <div class="wrapper" >
     <h1>Suggest a Media Item</h1>
      <?php if(isset($_GET["status"]) && $_GET["status"] == "thanks"){
          echo  "<p> Thanks for the email! I will check out your suggestion shortly!</p>"; } else {


      if(isset($error_message)){
            echo "<p class='message'>".$error_message ."</p>";
          }
            else {
              echo "<p>If you think there is something I&rsquo;m missing, let me know! Complete the form to send me an email.</p>";
          }

      ?>