Using JavaMail in a webapp

Hello,

Im coding a web app in which there is an option to send an email with some data using our Exchange server.

Im using a servlet and a class with the JavaMail api to do that, but I want to authenticate that the person sending the email has a valid Exchange username and password, but I can write anything on those fields and the email is sent without a problem.

This is my mail client code:

public static void sendEmail(String toAddress, String html,String cuenta) 
            throws AddressException,
            MessagingException {
 
        final String userName = "myexchangemail@mailserver.com";
        final String password = "1234";
        Properties properties = new Properties();
        properties.put("mail.transport.protocol", "smtp");
        properties.put("mail.smtp.host", "smtp.mailserver.com");
        properties.put("mail.smtp.auth", "true");
        properties.put("mail.smtp.port", "25");
        
        
        Authenticator auth = new Authenticator() {
            @Override
            public PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(userName, password);
            }
        };
 
        Session session = Session.getInstance(properties, auth);
 
        Message msg = new MimeMessage(session);
 
        msg.setFrom(new InternetAddress(userName));
        InternetAddress[] toAddresses = InternetAddress.parse(toAddress) ;
        msg.setContent(html,"text/html");
        msg.setRecipients(Message.RecipientType.TO, toAddresses);
        msg.setSubject("Test Email");
        msg.setSentDate(new Date());
        Transport.send(msg);
}

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I need that only correct username/password combinations of existing exchange mailboxes work on this webapp.