public static void main(String[] args) throws IOException {
    String [] to = {"lawrence6@gmail.com", "kinr@gmail.com"}; // to address. It can be any like gmail, hotmail etc.
    final String from = "hyella@zohomail.com"; // from address. As this is using Gmail SMTP.
    final String password = "xxxxxx"; // password for from mail address.

    //Set smtp connection attributes
    Properties prop = new Properties();
    prop.put("mail.smtp.host", "smtp.zoho.com");
    prop.put("mail.smtp.port", "465");
    prop.put("mail.smtp.auth", "true");
    prop.put("mail.smtp.startssl.enable", "true");
    prop.put("mail.debug", "true");
    prop.put("mail.smtp.socketFactory.port", "465");
    prop.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");

    //create new session with an authenticator
    Authenticator auth = new Authenticator() {
        protected PasswordAuthentication getPasswordAuthentication() {
            return new PasswordAuthentication(from, password);
        }
    };

    Session session = Session.getInstance(prop, auth);

    try {

        Message message = new MimeMessage(session);
        message.setFrom(new InternetAddress(from));
        InternetAddress[] toAddress = new InternetAddress[to.length];

        // To get the array of the "to" addresses
        for (int i = 0; i < to.length; i++) { // changed from a while loop
            toAddress[i] = new InternetAddress(to[i]);
        }

        //Set header field of the header
        for (int i = 0; i < toAddress.length; i++) {
            message.addRecipient(Message.RecipientType.TO, toAddress[i]);
        }

        message.setSubject("CBN ECM JAVA");

        String msg = "<h1>This email sent using Java Code!!!</h1>";
        msg += "<b>Wish you a nice day!</b><br>";
        msg += "<font color=red>Forty-two</font>";

        MimeBodyPart mimeBodyPart = new MimeBodyPart();
        mimeBodyPart.setContent(msg, "text/html");

        Multipart multipart = new MimeMultipart();
        multipart.addBodyPart(mimeBodyPart);

        MimeBodyPart attachmentBodyPart = new MimeBodyPart();
        attachmentBodyPart.attachFile(new File("C://Xampp//successful.JPG"));
        multipart.addBodyPart(attachmentBodyPart);
        message.setContent(multipart);

        Transport.send(message);

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

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