高分:25端口关闭,javamail仍然可以发送邮件的有关问题,付代码

// DNS服务器，看看本机的DNS配置        String dns = "dns://192.168.0.1";        String email = "xxx@msn.com";        if(args.length>0)         email = args[0];        String domain = email.substring(email.indexOf('@')+1);        Hashtable env = new Hashtable();        env.put(Context.INITIAL_CONTEXT_FACTORY,          "com.sun.jndi.dns.DnsContextFactory");        env.put(Context.PROVIDER_URL, dns);        DirContext ctx = new InitialDirContext(env);        Attributes attr = ctx.getAttributes(domain, new String[]{"MX" });        NamingEnumeration servers = attr.getAll();        // 列出所有邮件服务器：        while(servers.hasMore()) {         Attribute hosts = (Attribute)servers.next();         for(int i=0;i<hosts.size();i++){          String host = (String)hosts.get(i);          host = host.substring(host.indexOf(' ')+1);          System.out.print("Send mail to " + host + " ...");          sendMail(host, email);          System.out.println("OK");         }        }