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I am trying to send an email from my program through a TLS connection. Here is my code final String username = "XXXXXX"; final String password = "XXXXX"; Properties props = new Properties(); props.put("mail.transport.protocol", "smtp"); props.put("mail.smtp.starttls.enable","true"); props.put("mail.smtp.auth", "true"); props.put("mail.smtp.host", "mail.xxxx.com"); props.put("mail.smtp.port", "587"); Session session = Session.getInstance(props, new javax.mail.Authenticator() { protected PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication(username, password); } }); Message message = new MimeMessage(session); message.setFrom(new InternetAddress("from@xxxx.com")); message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to_address)); message.setSubject("Test Mail"); message.setText("TestMail "); Transport.send(message) My email gateway has incoming Mail settings with SSL enabled and outgoing with TLS enabled on port 587. I am able to configure this settings in outlook and it's working fine. But through my java program it's saying "Connection Refused". Help Appreciated! Worked Finally: I used the InstallCert program to import the certicate to generate jssecacerts file and I added the file to my /jre/lib/security/ path. here is my working code properties.put("mail.transport.protocol", "smtp"); properties.put("mail.smtp.host", "XXXXXX"); properties.put("mail.smtp.port", "465"); properties.put("mail.smtp.ssl.enable", true); properties.put("mail.smtp.socketFactory.port", "465"); properties.put("mail.smtp.socketFactory.class","javax.net.ssl.SSLSocketFactory"); properties.put("mail.smtp.socketFactory.fallback", "false");

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