通过 Exchange 使用 Javamail 发送 Email

Question

I'm having some troubles sending emails via Javamail using my company exchange server. We have an application that was sending emails via the gmail server without any problems, but for some changes in the policies of Google we want to use the company server to do the job. Im sure the problem in the session properties, but i cant find a way to make it work

    Properties props = new Properties();
    props.put("mail.smtp.port", 465);
    props.put("mail.smtp.socketFactory.port", 465);
    props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
    props.put("mail.smtp.socketFactory.fallback", "false");
    props.put("mail.smtp.auth", "true");
    props.put("mail.debug", "true");
    props.put("mail.smtp.host", _server);

    session = Session.getInstance(props, this);
    try {
        transport = session.getTransport("smtp");
        transport.connect("mail.company.com",_user,_pass);
        transport.close();

This is the error is showing the log

javax.mail.MessagingException: Could not connect to SMTP host: mail.company.com, port: 443; nested exception is: avax.net.ssl.SSLHandshakeException: java.security.cert.CertPathValidatorException: Trust anchor for certification path not found.

Answer 1

You have to check your email provider and its SMTP settings; server, port and encryption method.

The following code snippet works with me

Put

        //1) get the session object     
        Properties properties = new Properties();
        properties.put("mail.smtp.auth", "true");
        // You have missed this line.
        properties.put("mail.smtp.starttls.enable", "true");
        // This SMTP server works with me for all Microsoft email providers, like: -
        // Outlook, Hotmail, Live, MSN, Office 365 and Exchange.
        properties.put("mail.smtp.host", "smtp.live.com");
        properties.put("mail.smtp.port", "587");
        properties.put("mail.smtp.user", user);
        properties.put("mail.smtp.pwd", password);

        Session session = Session.getInstance(properties, null);
        session.setDebug(true); // To trace the code implementation.

        Transport transport = session.getTransport("smtp");
        transport.connect("smtp.live.com", 587, user, password);
        transport.close();

instead of

    props.put("mail.smtp.port", 465);
    props.put("mail.smtp.socketFactory.port", 465);
    props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
    props.put("mail.smtp.socketFactory.fallback", "false");
    props.put("mail.smtp.auth", "true");
    props.put("mail.debug", "true");
    props.put("mail.smtp.host", _server);

    session = Session.getInstance(props, this);
    try {
        transport = session.getTransport("smtp");
        transport.connect("mail.company.com",_user,_pass);
        transport.close();

I found this website so helpful, in getting other email providers SMTP settings information.