How to send e-mail from a simple java program ?

Use Mail API

import java.util.Properties;

import javax.mail.Message;

import javax.mail.MessagingException;

import javax.mail.Session;

import javax.mail.Transport;

import javax.mail.internet.AddressException;

import javax.mail.internet.InternetAddress;

import javax.mail.internet.MimeMessage;

public class SendMail {

    private String from;

    private String to;

    private String subject;

    private String text;

    public SendMail( String from, String to,String subject,
                     String text) {

        this.from = from;

        this.to = to;

        this.subject = subject;

        this.text = text;

    }

    

    void send() {

        Properties props = new Properties();

        // start tls true

        props.put("mail.smtp.starttls.enable", "true"); 

        // set host of mail server to whoom we are sending mail

        props.put("mail.smtp.host", "smtp.gmail.com");  

        // Set the mail server port

        props.put("mail.smtp.port", "465");  

        

        Session mailSession = Session.getDefaultInstance(props);

        Message simpleMessage = new MimeMessage(mailSession);

        

        InternetAddress fromAddress = null;

        InternetAddress toAddress = null;

        

        try {

            fromAddress = new InternetAddress(from);

            toAddress = new InternetAddress(to);

        } catch (AddressException e) {

            e.printStackTrace();

        }

        

        try {

            simpleMessage.setFrom(fromAddress);

            simpleMessage.setRecipient(Message.RecipientType.TO, toAddress);

            simpleMessage.setSubject(subject);

            simpleMessage.setText(text);

            Transport.send(simpleMessage);

            System.out.println("Mail sent successully ");

        } catch (MessagingException e) {

            e.printStackTrace();

        }

    }

}

public class SendMailTest {

    /**

     * @param args

     */

    public static void main(String[] args) {

        String from = "xyz@gmail.com";

        String to = "abc@gmail.com";

        String subject = "Test";

        String message = "Test message from java program";

        

        SendMail sendMail = new SendMail(from, to, subject, message);

        sendMail.send();

    }

}