code: public static void deliverMail (String recipient, String sender,
                                      String subject, String body)
          throws IOException
      {
          deliverMail(new String[] { recipient }, sender, subject, body);
      }
docs: Delivers the supplied mail message using the machine's local mail
  SMTP server which must be listening on port 25.
  
  @exception IOException thrown if an error occurs delivering the
  email. See {@link Transport#send} for exceptions that can be thrown
  due to response from the SMTP server.