BufferedReader.readLine() hænger

Jeg har lavet en klasee til at hente mine mails via pop3.
Men metoden receive() hænger da BufferedReader.readline() ser ud som om at den bare hænger.

------------------------------------
package Mail;
import java.util.*;
import java.io.*;
import java.net.*;
import Logic.Setting;
/**
* <p>Title: ZedCash Proxy Checker</p>
*
* <p>Description: Inbox Proxy Checker</p>
*
* <p>Copyright: Copyright (c) 2007</p>
*
* <p>Company: ZedCash</p>
*
* @author Schaumann
* @version 0.1a
*/
public class POP3 {
  private String host;
  private String user;
  private String pass;
  private int port;
  private boolean delete;
  private PrintWriter out;
  private BufferedReader in;
  private Socket socket;
 
  public POP3(String _host,String _user, String _pass,int _port,boolean _deleteEmail){
    this.host = _host;
    this.user = _user;
    this.pass = _pass;
    this.port = _port;
    this.delete = _deleteEmail;
  }
 
  public boolean connect(){
    boolean connected = false;
    try {
      socket = new Socket(host, port);
      out = new PrintWriter(socket.getOutputStream());
      in = new BufferedReader(new InputStreamReader(socket.getInputStream()));   
      connected = socket.isConnected();
    }
    catch (UnknownHostException ex) {
      return connected;
    }
    catch (IOException ex) {
      return connected;
    }
    return connected;
  }
 
  public boolean login(){
    boolean isLoggedIn = false;
    receive();
    send("user "+user);
    receive();
    send("pass "+pass);
    receive();
    send("STAT");
    if(receive().contains((CharSequence)"OK"))
      isLoggedIn = true;
    return isLoggedIn;
  }
 
  public ArrayList downloadEmails(){
    ArrayList emails = new ArrayList();
    send("LIST");
    receive();
    return emails;
  }
 
 
 
  private void send(String cmd){
    if(Setting.getDebug())
      System.out.println("SENT > "+cmd);
    out.print(cmd);
    out.print("\r\n");
    out.flush();
  }

  private String receive(){
    String s = null;
    try {
      String line = null;
      while( (line = in.readLine() ) !=null ) {
        s = s + line;
      }
    }
    catch (IOException ex) {
      if(Setting.getDebug())
        System.out.println(ex.toString());
      return ex.toString();
    }
    if(Setting.getDebug())
      System.out.println("RECEIVE < "+s);
    return s;
  } 
 
  public void endSession(){
    send("QUIT");
    receive();
  }
}