Two sample code using javamail

package vincent.mail;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Properties;
import javax.mail.*;

/**
 * @author vincent.yang
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public class retrieveEmail {
    public static void main(String args[]) throws Exception{
        String host = "xxxxx";
        String username = "xxxxxx";
        String password = "xxxxxxx";
        Properties prop = new Properties();
        Session session = Session.getDefaultInstance(prop,null);
        Store store = session.getStore("pop3");
        store.connect(host,username,password);
        Folder folder = store.getFolder("INBOX");
        folder.open(Folder.READ_ONLY);
        BufferedReader bReader = new BufferedReader(new InputStreamReader(System.in));
        Message msg[] = folder.getMessages();
        for(int i=0,n=msg.length;i<n;i++){
            System.out.println(i + ": " + msg[i].getFrom()[0] + msg[i].getSubject());
            System.out.println("Do you wanna read the message? [y/n]");
            String line = bReader.readLine();
            if("y".equals(line)){
                System.out.println(msg[i].getContent());
            }
            else if("n".equals(line)){
                break;
            }
            folder.close(false);
            store.close();
        }
       
       
    }

}
*****************************************************************************

package vincent.mail;

import java.util.Properties;
import javax.mail.*;
import javax.mail.internet.*;

/**
 * @author vincent.yang
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public class sendMail {
    public static void main(String args[]) throws Exception{
        //the host for smtp
        String host = "xxxx";//xxxx
        String from = "xxxxx";
        String to = "xxxx";
        Properties prop = System.getProperties();
        prop.put("mail.stmp.host",host);
        //prop.put("mail.smtp.auth","true");
        Session session = Session.getDefaultInstance(prop,null);
        MimeMessage msg = new MimeMessage(session);
        msg.setFrom(new InternetAddress(from));
        msg.addRecipient(Message.RecipientType.TO,new InternetAddress(to));
        msg.setSubject("cool man");
        msg.setText("Hello,I am cool man");
        Transport transport = session.getTransport("smtp");
        transport.connect(host,"vincentyang","56944185");
        transport.sendMessage(msg,msg.getAllRecipients());
        transport.close();
       
       
       
       
    }

}