Properties props = new Properties();
Session sendMailSession;
Transport transport;
sendMailSession = Session.getInstance(props, null);
props.put("mail.smtp.host", "smtp.sina.com.cn"); //"202.106.187.180" 是“smtp.sina.com.cn”的IP!
props.put("mail.smtp.auth", "true"); //允许smtp校验
transport = sendMailSession.getTransport("smtp");
transport.connect("smtp.sina.com.cn","你的用户名","你的密码"); //你在sina的用户名,密码...........
Message newMessage = new MimeMessage(sendMailSession);