Remetente em JAVA

import java.io.IOException;  
import java.io.PrintStream;  
  
import sun.net.smtp.SmtpClient;  
  
public class email 
{  

    public void enviaemail() 
    {  
      String from = "[email removido]";  
      String to = "[email removido]";  
 
         try 
         {  
            SmtpClient client = new SmtpClient("smtp.netcon.com.br");  
            client.from(from);  
            client.to(to);  
            PrintStream msg = client.startMessage();  
            msg.println("to: Teste" + to);  
            msg.println("Subject: Assunto");  
            msg.print("\r\n");  
            msg.println("teste");  
            msg.println("Acesse http://teste.com ");  
            client.closeServer();  
         } 
         catch (IOException e) 
         {  
            System.out.println("error" + e);  
         }  
 
     }

     public static void main(String args[])  
     {  
          email e = new email();  
          e.enviaemail();  
          System.out.println("Enviando o e-mail...");  
     }  
}