Аутентификация в java

import java.io.*;
import java.net.*;
import java.time.*;
import java.util.*;
import java.io.*;
import java.io.UnsupportedEncodingException;    
import javax.xml.bind.DatatypeConverter;
 
public class Class1 {
    public static void main(String[] argc)
    {
    Socket s1;
    PrintStream p1;
    DataInputStream d1;
    String recvreply;
    try
    {
    s1=new Socket("smtp.sibnet.ru",25);
    d1=new DataInputStream(new BufferedInputStream(s1.getInputStream(),2500));
    p1=new PrintStream(new BufferedOutputStream(s1.getOutputStream(),2500),true);
    recvreply=d1.readLine();
    System.out.println("Server Response : " + recvreply);
    p1.println("HELO: smtp.sibnet.ru");
    recvreply=d1.readLine();
    System.out.println("Server Response : " + recvreply);
 
    
 
    String str1 = "redfusi@sibnet.ru";
    // encode data using BASE64
    String encoded1 = DatatypeConverter.printBase64Binary(str1.getBytes());
    System.out.println("encoded value is \t" + encoded1);
 
 
    
    String str2 = "rasengan23";
    // encode data using BASE64
    String encoded2 = DatatypeConverter.printBase64Binary(str2.getBytes());
    System.out.println("encoded value is \t" + encoded2);
    
    
    String r="AUTH LOGIN:";
    String h1=r;
    r=r+encoded1+encoded2;
    h1=h1+"VXNlcm5hbWU6,"+"UGFzc3dvcmQ6";
    System.out.println(h1);
    p1.println(h1);
    recvreply=d1.readLine();
    System.out.println("Server Response : " + recvreply);
    
    
    
    
    p1.println("MAIL FROM: <redfusi@sibnet.ru>");
    recvreply=d1.readLine();
    System.out.println("Server Response : " + recvreply);
    p1.println("RCPT TO: <redfusi@sibnet.ru>");
    recvreply=d1.readLine();
    System.out.println("Server Response : " + recvreply);
    p1.println("DATA");
    recvreply=d1.readLine();
    System.out.println("Server Response : " + recvreply);
    p1.println("From: redfusi@sibnet.ru");
    p1.println("Reply-To: redfusi@sibnet.ru");
    
    
    
    p1.println("Subject: e");//ТЕМА
   
    Date date = new Date();
 
    /*String h=date.toString();
    h=h.substring(0,16);
    h=h.substring(11);
    String j="Date: ";*/
    
    Calendar c=Calendar.getInstance(); 
 
    int year=c.get(c.YEAR); 
    int month=c.get(c.MONTH)+1; 
    int day=c.get(c.DAY_OF_MONTH);
    
    
    
    
    
 
    
    String d;
    
    String b = String.valueOf(year);
    String b1 = String.valueOf(month);
    String b2 = String.valueOf(day);
    System.out.println(b);
    System.out.println(b1);
    System.out.println(b2);
    d=b+b1+b2;
 
    
    
    
    
    
    
    p1.println(d);//ДАТА
    
    
    
    
    p1.println("Content-Type: text/html; charset=us-ascii");
    p1.println("Content-Transfer-Encoding: 7-bit");
    p1.println("\r\n");
    p1.println("Bye for Now");//ТЕКСТ
    p1.println(".");
    recvreply=d1.readLine();
    System.out.println("Server Response : " + recvreply);
    p1.println("QUIT");
    recvreply=d1.readLine();
    System.out.println("Server Response : " + recvreply);
    s1.close();
    System.out.println("Closed Connection with Server");
    }
    catch(IOException e)
    {
    System.out.println("Error in Connecting to Port");
    }
    // Вывод текущей даты и времени с использованием toString()
    }
    }