Le protocole SMTP: classe java

sjava.io.*;
import java.net.*;

class smtpClient {

  private String server, message, dest, origin;
  private int port;
  private Socket socket;

  public smtpClient (String serv, int por, String org)
  {
    server = serv;
    port = por;
    origin = org;
  }

  public void createMsg(String dst, String msg)
  {
    message = msg;
    dest = dst;

  }

  public void sendMsg()
  {
    PrintWriter to;
    BufferedReader from;
    String str;

    try {
      socket = new Socket(InetAddress.getByName(server),port);

      to = new PrintWriter(
                  new BufferedWriter (
                      new OutputStreamWriter (
                          socket.getOutputStream())),true);
      from = new BufferedReader(
                 new InputStreamReader (
                          socket.getInputStream()));

      str = from.readLine();
      to.println("helo plus.bas");
      str = from.readLine(); System.err.println(str);
      to.println("mail from: <"+origin+">");
      str = from.readLine(); System.err.println(str);
      to.println("rcpt to: <"+dest+">");
      str = from.readLine(); System.err.println(str);
      to.println("data");
      str = from.readLine(); System.err.println(str);
      to.println(message + "\r\n.\r\n");
      str = from.readLine(); System.err.println(str);

      socket.close();

    } catch ( Exception e ) {}


  }

  public static void main ( String args[] )
  {
    smtpClient c = new smtpClient("SMTP SERVER",25,"org@salemioche.com");

    c.createMsg("dest@salemioche.com","Coucou");

    c.sendMsg();