PHP mailer

if($_SERVER["REQUEST_METHOD"]=="POST") {
        $name = trim($_POST["name"]);
        $email = trim($_POST["email"]);
        $message = trim($_POST["message"]);

        if($name == "" OR $email == "" OR $message == ""){
            echo "You must specify a value for a name, email address, and message";
            exit;
        }

        foreach($_POST as $value){
            if(stripos($value,'Content-Type:') !== FALSE){
                exit;
            }
        }

        if($_POST["address"] != ""){
            echo "Your form submission has  an error";
            exit;
        }

        require_once("inc/phpmailer/class.phpmailer.php");
        include("inc/phpmailer/class.smtp.php"); 
        $mail = new PHPMailer;

        if(!$mail->ValidateAddress($email)){
            echo "You must specify a valid email address.";
            exit;
        }


        $email_body="";
        $email_body= $email_body . "Name: " .$name . "<br>";
        $email_body = $email_body . "Email: " . $email . "<br>";
        $email_body =$email_body . "Message: " . $message;

        $body             = file_get_contents('contents.html');
        $body             = preg_replace("[\]", '', $body);
        $mail->IsSMTP(); // enable SMTP
        $mail->SMTPAuth = true; // authentication enabled
        $mail->SMTPDebug=1;
        $mail->SMTPSecure= "ssl";
        $mail->Host = "smtp.gmail.com";
        $mail->Port = 465; 
        $mail->IsHTML(true);
        $mail->Username = "example@gmail.com";
        $mail->Password = "password";
        $mail->SetFrom($email, $name);
        $address = "example@gmail.com";
        $mail->AddAddress($address, "firstname lastname");

        $mail->Subject    = "Shirts 4 Mike Contact Form Submission | " . $name;
        $mail->MsgHTML($email_body);

        if(!$mail->Send()) {
          echo "There was a problem sending the email: " . $mail->ErrorInfo;
          exit;
        } 
        header("Location: contact.php?status=thanks");
        exit;
}