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While sending mail, I am getting this error: java.lang.RuntimeException: javax.mail.SendFailedException: Sending failed; nested exception is: class javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port: 465, response: -1 Here is my code: Properties props = new Properties(); props.put("mail.smtp.host", "smtp.gmail.com"); props.put("mail.smtp.starttls.enable", "true"); props.put("mail.smtp.socketFactory.port", "465"); props.put("mail.smtp.auth", "true"); props.put("mail.smtp.port", "465"); Session session = Session.getDefaultInstance(props, new javax.mail.Authenticator() { protected PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication("email", "password"); } }); try { Message message = new MimeMessage(session); message.setFrom(new InternetAddress("email")); message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(this.to)); message.setSubject("Testing"); message.setText("Hey, this is the testing email."); Transport.send(message); // ... } What is the cause of this error, and how can the problem be resolved?

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