TLS SMTP Mail Java throws SSLHandShakeException

Question

I'm trying to send Mail using SMTP, which set as default smtp server with 25,587 ports and TLS. MS Exchange 2010. All auth data is correct, because i can log in via web-interface of mail. Code below does work with gmail smtp server, but when i use my own smtp server it throws me error with cert paths:

javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

public static void SendMailTLS(String to, String subject, String body) throws Exception{

    try {
                java.util.Properties props =  new java.util.Properties();
                props.put("mail.smtp.host", "sample");
                props.put("mail.smtp.port", "587");
                props.put("mail.smtp.starttls.enable", "true");
                props.put("mail.smtp.auth", "true");
                props.put("mail.smtp.connectiontimeout", "10000");    
                final String EmailUser = "sample";
                final String EmailPassword = "sample";    
                Session session = Session.getInstance(props, new javax.mail.Authenticator() {
                          protected PasswordAuthentication getPasswordAuthentication() {
                            return new PasswordAuthentication(
                                EmailUser,EmailPassword);
                             }
                       });    session.setDebug(true);    
                InternetAddress fromAddress = new InternetAddress("sample",
                                        "sample");
                InternetAddress toAddress = new InternetAddress("sample",
                                        "sample");
                Message msg = new MimeMessage(session);
                msg.setFrom(fromAddress);
                msg.addRecipient(Message.RecipientType.TO,toAddress);
                msg.setSubject(subject);
                msg.setText(body);    
                Transport transport = session.getTransport("smtp");
                transport.connect();
                transport.sendMessage(msg, msg.getAllRecipients());
                } catch (MessagingException e) {e.printStackTrace();}
    }

Am I doing something wrong?

score 1 · Accepted Answer · answered Jul 20 '17 at 04:08

This error message means that your server named "sample" (the MS Exchange 2010 server) is using a certificate that is not trusted by your java runtime. You may probably be using a self-signed certificate. So you need to import this certificate into the Java Runtime certificate store, with keytool.

TLS SMTP Mail Java throws SSLHandShakeException

1 Answers1