Send mail in javax.mail without authentication

Question

I am using javax.mail to send mails in Java. Now that a part of the concept of my project changed I have to send a mail without authentication. I will have to change my createSession() method:

private void createSession() {
    properties.put("mail.smtp.auth", "true");
    properties.put("mail.smtp.starttls.enable", "true");
    properties.put("mail.smtp.host", server);
    properties.put("mail.smtp.port", port);

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

It is rather obvious that I should change mail.smtp.auth to false, but what else should I change?

Solution

private void createSession() {
    properties.put("mail.smtp.auth", "false");
     //Put below to false, if no https is needed
    properties.put("mail.smtp.starttls.enable", "true");
    properties.put("mail.smtp.host", server);
    properties.put("mail.smtp.port", port);

    session = Session.getInstance(properties);
}

I think, this would suffice.

Comments

[Bill Shannon]

And of course it depends on your server being configured to allow you to send mail without authenticating first. That might work fine within an intranet, otherwise it's an invitation to spam.

[Sami]

Still says Authentication Required. Please contact support

[Kris]

Authentication is a server policy. If the server requires authentication - you have to provide it!!

[Farooque]

put properties.put("mail.smtp.starttls.enable", "false"); as well.It worked for this after this change.

[R.A]

Pelase explain your answer.

[Vishwa Pratap]

This does not work if change mobile date, can anyone help me in this.