How to correctly set up sending an email with an attachment from the site?

Question

Email

I'm sending a message through my form.

$to = wpcf_option_2('wpcf_email_2');
    $subject   = 'Письмо с сайта belaurum.by (юр. лицо)';

    $name_2  = esc_attr($_POST['wpcf_name_2']);
    $email_2 = esc_attr($_POST['wpcf_email_2']);

    if(empty($email_2)) {
      $email_2 = '[email protected]';
    }
    $address_2 = esc_attr($_POST['wpcf_address_2']);
    $msg_2_2 = esc_attr($_POST['wpcf_msg_2']);
    $ur_name_2 = esc_attr($_POST['wpcf_ur_name_2']);

    $msg_2 = '<b>E-mail адрес:</b> ';
    $msg_2 .= $email_2;
    $msg_2 .= '<br />';

    $msg_2 .= '<b>Aдрес нахождения юридического лица:</b> ';
    $msg_2 .= $address_2;
    $msg_2 .= '<br />';
    $msg_2 .= '<b>Наименование юридического лица:</b> ';
    $msg_2 .= $ur_name_2;
    $msg_2 .= '<br />';
    $msg_2 .= '<b>Текст сообщения:</b>';
    $msg_2 .= $msg_2_2;
    $msg_2 .= '<br />';

    if(!empty($_FILES['wpcf_file_2']['name'])) {
      // $filename = $_FILES['wpcf_file_2']['name'];
      $message = "Имя пользователя: ".$name_2."\nEmail пользователя ".$email_2."\n\nАдрес сайта: ".$_SERVER['HTTP_REFERER'];

      $boundary = md5(date('r', time()));
      $filesize = '';
      $headers = "MIME-Version: 1.0\r\n";
      $headers .= "From: " . $email_2 . "\r\n";
      $headers .= "Reply-To: " . $email_2 . "\r\n";
      $headers .= "Content-Type: multipart/mixed; boundary=\"$boundary\"\r\n";
      $message="
      Content-Type: multipart/mixed; boundary=\"$boundary\"

      --$boundary
      Content-Type: text/plain; charset=\"utf-8\"
      Content-Transfer-Encoding: 7bit

      $message";
           if(is_uploaded_file($_FILES['wpcf_file_2']['tmp_name'])) {
               $attachment = chunk_split(base64_encode(file_get_contents($_FILES['wpcf_file_2']['tmp_name'])));
               $filename = $_FILES['wpcf_file_2']['name'];
               $filetype = $_FILES['wpcf_file_2']['type'];
               $filesize = $_FILES['wpcf_file_2']['size'];
               $message.="

      --$boundary
      Content-Type: \"$filetype\"; name=\"$filename\"
      Content-Transfer-Encoding: base64
      Content-Disposition: attachment; filename=\"$filename\"

      $attachment";
           }
         $message.="
      --$boundary--";


    } else {

      $headers = array(
       "MIME-Version: 1.0",
       "From: $name_2 <$email_2>",
       "Content-Type: text/html; charset=\"" . get_option('blog_charset') . "\"",
     );
     $message = '';
     $message .= "<b>$name_2</b> написал:<br /><br />";
 		$message .= str_replace("\n", "<br />", $msg_2);
    }



    if( wp_mail( $to, $subject, $message, $headers) ){
      echo '<div class="succsess"><p>Ваше письмо было отправлено. Наш менеджер свяжется с Вами в ближайшее время</p></div>';

the letter is sent, but on email it comes like this