trying to connect to host "mail.tr158.cn", port 50, isSSL false

在javamail中出现trying to connect to host "mail.tr158.cn", port 50, isSSL false的时候，

解决方法：

1：查看你的邮件服务器配置是否正确；

2：缺少身份验证。
Session session=Session.getInstance(props, new javax.mail.Authenticator() {
            protected javax.mail.PasswordAuthentication getPasswordAuthentication() {
                 return new javax.mail.PasswordAuthentication(username, password);
            }
          });