Sending mail: java.net.SocketException: Network is unreachable: connect

Question

Try send mail via javax.mail:

Properties props = new Properties();
props.put(\"mail.smtp.host\", \"xxxxx\");
props.put(\"mail.smtp.port\", \"25\");
props.put         


        

Answer 1

The answer is: java prefer IPv6, but something wrong with it in our company. Adding property java.net.preferIPv4Stack=true solves problem.