javax.mail.MessagingException : Could not connect to SMTP host : mysmtpadd.com, port : 25

import java.util.Properties;
import javax.activation.*;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.AddressException;
import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;


public class Mail {
    
	public static void main(String[] args) {
        try {
            new Email().sendSimpleMail("Test from Java", "meerapkotecha@gmail.com", "info@milindvthakkar.com", "Testing...");

        }
        catch(Throwable e) {
            e.printStackTrace();
        }
    }

    public static class Email {
        public void sendSimpleMail(String subject, String to, String from,String messageText) throws AddressException, MessagingException {

            Properties mailProps = new Properties();
            mailProps.put("mail.transport.protocol", "smtp");
            mailProps.put("mail.smtp.starttls.enable", "true");
            mailProps.put("mail.smtp.host", "mail.milindvthakkar.com");
            mailProps.put("mail.smtp.auth", "true");
            mailProps.put("mail.smtp.user", "info@milindvthakkar.com");
            mailProps.put("mail.debug", "true");
            mailProps.put("mail.smtp.port", "25");
            mailProps.put("mail.smtp.debug", "true");
   
            Authenticator auth = new MailAuthenticator();
            Session session = Session.getDefaultInstance(mailProps, auth);

            Message message = new MimeMessage(session);

            message.setFrom(new InternetAddress(from));
            message.setRecipient(Message.RecipientType.TO, new InternetAddress(to));

            message.setSubject(subject);

            message.setContent(messageText, "text/html");

            Transport.send(message);
        }

        private class MailAuthenticator extends javax.mail.Authenticator {
            public PasswordAuthentication getPasswordAuthentication() {
                String user = "info@milindvthakkar.com";
                String pwd = "abcd";
                return new PasswordAuthentication(user, pwd);
            }
        }
    }
}

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