$to = 'email@example.com';
    $from = 'email@example.com';
    $subject = 'test subject';

    $module = '';
    $token = time();

    $message = array(
      'id' => $module . '_' . $token,
      'to' => $to,
      'subject' => $subject,
      'body' => array(
        "example body"
      ),
      'headers' => array(
        'From' => $from,
        'Sender' => $from,
        'Return-Path' => $from,
        'MIME-Version' => '1.0',
        'Content-Type' => 'text/plain; charset=UTF-8',
      ),
      'params' => array(
        // 'attachments' => array(
        //   0 => array(
        //     'path' => "public://invites/test.ics",
        //     'filecontent' => "",
        //     'filename' => "test.txt",
        //     'mime' => "text/plain",
        //     'encoding' => 'base64',
        //     'disposition' => 'attachment',
        //     //'list' => TRUE,
        //   ),
        // ),
      ),
    );


    $system = drupal_mail_system($module, $token);
    $message = $system->format($message);

    if ($system->mail($message)) {
      print "sent";
    }
    else {
      print "not sent";
    }