javamial发信如何通过smtp验证呀

Question

Properties props = System.getProperties();
      InternetAddress fromAddress = null ;
      props.put("mail.smtp.host", smtp);
      props.put("mail.smtp.auth", "true");
      URLName urlName=new URLName(smtp);
      PasswordAuthentication pa=new PasswordAuthentication(user,password);
      Session session = Session.getDefaultInstance(props,null);  //初始化Session 变量session
      session.setPasswordAuthentication(urlName,pa);//身份验证
      ......//设置邮件体(msg)信息
      Transport transport = session.getTransport("smtp");
      transport.connect(smtp,user,password);