Email

import org.springframework.mail.javamail.JavaMailSenderImpl;
import org.springframework.mail.javamail.MimeMessageHelper;

import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.io.UnsupportedEncodingException;
import java.util.Properties;

/*
* REF : https://javaee.github.io/javamail/docs/api/com/sun/mail/smtp/package-summary.html
*/
public class Email {

    public static void main(String[] args) {
        sendEmail(
                "",
                "",
                "testing email",
                "",
                ""
        );

    }

    public static void sendEmail(String emailFrom, 
                                 String emailTo, 
                                 String message, 
                                 String username, 
                                 String password) {
        try {
            JavaMailSenderImpl mailSender = new JavaMailSenderImpl();
            mailSender.setHost("smtp.gmail.com");
            mailSender.setPort(465);
            mailSender.setUsername(username);
            mailSender.setPassword(password);

            Properties props = mailSender.getJavaMailProperties();
            props.put("mail.debug", true);
            props.put("mail.smtp.ssl.enable", true);
            props.put("mail.smtp.starttls.enable", true);
            props.put("mail.smtp.auth", true);

            MimeMessage mimeMessage = mailSender.createMimeMessage();

            MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, false);
            helper.setFrom(new InternetAddress(username, emailFrom));
            helper.setTo(emailTo);
            helper.setSubject("testing");
            helper.setText(message, true);

            mailSender.send(mimeMessage);

        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }

    public static void sendMail(String emailFrom, 
                                String emailTo, 
                                String message, 
                                String username, 
                                String password) {

        Properties prop = new Properties();
        prop.put("mail.smtp.auth", "true");
        prop.put("mail.debug", "true");
        prop.put("mail.smtps.ssl.enable", "true");
        prop.put("mail.smtp.starttls.enable", "true");
        prop.put("mail.smtp.host", "smtp.gmail.com");
        prop.put("mail.smtp.port", "587");

        Session session = Session.getInstance(prop, new javax.mail.Authenticator() {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(username, password);
            }
        });

        Message msg = new MimeMessage(session);

        try {
            msg.setFrom(new InternetAddress(emailFrom, emailFrom));
            msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(emailTo));
            msg.setSubject("Testing Email From");
            msg.setContent(message, "text/html; charset=utf-8");
            Transport.send(msg);
        } catch (UnsupportedEncodingException | MessagingException e) {
            e.printStackTrace();
        }

    }


}