Send Mail in Java using SMTP

import java.util.Properties;
import javax.mail.Authenticator;
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;

public class EmailUtil {
    public static void sendEmail() {
    	 Session session = null;
       
        try {
        	Properties properties = System.getProperties();
            properties.put("mail.smtp.host", "mail.example.com");
            properties.put("mail.smtp.auth", "false");
            properties.put("mail.smtp.port", "25"); //SMTP Port
     		session = Session.getInstance(properties);
             
            MimeMessage message = new MimeMessage(session);
            message.setFrom(new InternetAddress("mailFrom@example.com"));
            message.addRecipient(Message.RecipientType.TO, new InternetAddress("mailTo@example.com"));
            message.setSubject("My Subject");
            message.setText("My Body");
            Transport.send(message);
        } catch (MessagingException e) {
            e.printStackTrace();
        } finally {
        }
    }
}

import java.util.Properties;
import javax.mail.Authenticator;
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;

public class EmailUtil {
    public static void sendEmail() {
    	 Session session = null;
       
        try {
        	Properties properties = System.getProperties();
            properties.put("mail.smtp.host", "mail.example.com");
            properties.put("mail.smtp.port", "587"); //TLS Port
            properties.put("mail.smtp.auth", "true");
            properties.put("mail.smtp.starttls.enable", "true"); //enable STARTTLS

            Authenticator authen = new Authenticator() {
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication(apiKey, serectKey);
                }
            };
            
            session = Session.getInstance(properties, authen);
             
            MimeMessage message = new MimeMessage(session);
            message.setFrom(new InternetAddress("mailFrom@example.com"));
            message.addRecipient(Message.RecipientType.TO, new InternetAddress("mailTo@example.com"));
            message.setSubject("My Subject");
            message.setText("My Body");
            Transport.send(message);
        } catch (MessagingException e) {
            e.printStackTrace();
        } finally {
        }
    }
}

import java.util.Properties;
import javax.mail.Authenticator;
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;

public class EmailUtil {
    public static void sendEmail() {
    	 Session session = null;
       
        try {
        	Properties properties = System.getProperties();
            properties.put("mail.smtp.host", "mail.example.com");
            props.put("mail.smtp.socketFactory.port", "465"); //SSL Port
            props.put("mail.smtp.socketFactory.class",
                    "javax.net.ssl.SSLSocketFactory"); //SSL Factory Class
            props.put("mail.smtp.auth", "true"); //Enabling SMTP Authentication
            props.put("mail.smtp.port", "465"); //SMTP Port

            Authenticator authen = new Authenticator() {
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication(apiKey, serectKey);
                }
            };
            
            session = Session.getInstance(properties, authen);
             
            MimeMessage message = new MimeMessage(session);
            message.setFrom(new InternetAddress("mailFrom@example.com"));
            message.addRecipient(Message.RecipientType.TO, new InternetAddress("mailTo@example.com"));
            message.setSubject("My Subject");
            message.setText("My Body");
            Transport.send(message);
        } catch (MessagingException e) {
            e.printStackTrace();
        } finally {
        }
    }
}