JavaMail with MS Exchange: No authentication mechansims supported by both server and client

Question

I\'ve been trying for days now to send mail from Grails application and unsuccessfully. I\'m using:

• grails 1.3.7
• mail 1.0 plugin
• spring-secur

Answer 1

Well it looks that I had few problems. At first, Exchange wasn't setup correctly. And then it seems I've tried all possible configurations but the right one. This works:

class MymailService 
{
    boolean transactional = false

    public sendMessage(String to, String cc, String msgSubject, String msgText) 
    {
        String host = "mail.mailserver.com";
        String username = "myusername@mymailserver.com"; 
        String password = "xxx"; 
        String from = "myusername@mymailserver.com";
        String port = "25";

        Properties props = System.getProperties();
        props.put("mail.smtp.host", host);
        props.put("mail.smtp.port", port); 
        props.put("mail.smtp.auth", "false");

        Transport transport = null;

        try{
            Session session = Session.getDefaultInstance(props, null);
            MimeMessage message = new MimeMessage(session);
            message.setFrom(new InternetAddress(from));

        InternetAddress to_address = new InternetAddress(to);
        message.addRecipient(Message.RecipientType.TO, to_address);

        InternetAddress cc_address = new InternetAddress(cc);
        message.addRecipient(Message.RecipientType.CC, cc_address);

        message.setSubject(msgSubject);
        message.setText(msgText);

        transport = session.getTransport("smtp");
        transport.connect();
        transport.sendMessage(message, message.getAllRecipients());
    } finally {
        if (transport != null) try { transport.close(); } catch (MessagingException logOrIgnore){}
    }
}
}

The final clue was Bill Shannon's post. Thanks Bill!