PHP Validation $email

// POST Method for sending Form information
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));

    //echo $email;

    if ($name == "" || $email = "" || $details = "") {
        echo "Please fill in the required fields: Name, Email, Details";
        exit;
    }

    echo $email;

    if ($_POST["address"] != "") {
        echo "Bad form input";
        exit;
    }

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

    $mail = new PHPMailer;


    if (!$mail->ValidateAddress($email)) {
        echo "E-Mail:" . $email;
        echo "Invalid Email Address";
        exit;
    }

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

    $mail->setFrom('from@example.com', 'Mailer');
    $mail->addAddress('joe@example.com', 'Joe User');
    $mail->addAddress('from@example.com');
    $mail->addReplyTo('info@example.com', 'Information');
    $mail->setCC('cc@example.com');
    $mail->setBCC('bcc@example.com');

    $mail->addAttachment('/var/tmp/file.tar.gz');
    $mail->addAttachment('/tmp/image.jpg', 'new.jpg');
    $mail->isHTML(true);

    $mail->Subject = 'Here is the subject';
    $mail->Body = 'This is the HTML message body <b>in bold!</b>';
    $mail->AltBody = 'This is the body in plain text for non-HTML mail clients';



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


$pageTitle = "Suggest a Media Item";
$section = "suggest";
include("inc/header.php");