c# 批量验证qq邮箱是否真实存在

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

using System.Net.Mail;
using System.Management;


using System.Diagnostics;
using System.IO;
using System.Text.Regularexpressions;
using System.Net;
using System.Net.Sockets;

namespace CheckMailbox
{
    public partial class Form1 : Form
    {
        TcpClient tcpc;
        NetworkStream s;
        string strDomain;
        byte[] bb;
        int len;
        string read;
        string stringTosend;
        byte[] arrayToSend;
        bool flag;
        int count=0;

        public Form1（）
        {
            InitializeComponent（）;
        }

        public string getMailServer（string

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件       5612  2009-04-04 10:51  CheckMailbox\CheckMailbox\Properties\Resources.resx

     文件        249  2009-04-04 10:51  CheckMailbox\CheckMailbox\Properties\Settings.settings

     文件       1196  2009-04-04 10:51  CheckMailbox\CheckMailbox\Properties\AssemblyInfo.cs

     文件       2878  2009-04-04 10:51  CheckMailbox\CheckMailbox\Properties\Resources.Designer.cs

     文件       1095  2009-04-04 10:51  CheckMailbox\CheckMailbox\Properties\Settings.Designer.cs

     文件       5851  2009-04-16 21:07  CheckMailbox\CheckMailbox\Form1.Designer.cs

     文件       6008  2009-04-16 21:07  CheckMailbox\CheckMailbox\Form1.resx

     文件       3278  2009-04-04 11:38  CheckMailbox\CheckMailbox\CheckMailbox.csproj

     文件       5632  2005-11-11 22:25  CheckMailbox\CheckMailbox\bin\Debug\CheckMailbox.vshost.exe

     文件      24576  2009-04-17 23:45  CheckMailbox\CheckMailbox\bin\Debug\CheckMailbox.exe

     文件      28160  2009-04-17 23:45  CheckMailbox\CheckMailbox\bin\Debug\CheckMailbox.pdb

     文件        180  2009-04-16 21:07  CheckMailbox\CheckMailbox\obj\Debug\CheckMailbox.Form1.resources

     文件        180  2009-04-04 11:12  CheckMailbox\CheckMailbox\obj\Debug\CheckMailbox.Properties.Resources.resources

     文件      24576  2009-04-17 23:45  CheckMailbox\CheckMailbox\obj\Debug\CheckMailbox.exe

     文件        842  2009-04-16 21:07  CheckMailbox\CheckMailbox\obj\Debug\CheckMailbox.csproj.GenerateResource.Cache

     文件      28160  2009-04-17 23:45  CheckMailbox\CheckMailbox\obj\Debug\CheckMailbox.pdb

     文件        303  2009-04-18 12:55  CheckMailbox\CheckMailbox\obj\CheckMailbox.csproj.FileList.txt

     文件       7790  2009-04-17 23:45  CheckMailbox\CheckMailbox\Form1.cs

     文件        471  2009-04-04 10:51  CheckMailbox\CheckMailbox\Program.cs

     文件        925  2009-04-04 10:51  CheckMailbox\CheckMailbox.sln

    ..A..H.     14336  2009-04-18 12:56  CheckMailbox\CheckMailbox.suo

     目录          0  2009-04-04 10:51  CheckMailbox\CheckMailbox\obj\Debug\TempPE

     目录          0  2009-04-04 11:01  CheckMailbox\CheckMailbox\obj\Debug\Refactor

     目录          0  2009-04-04 10:51  CheckMailbox\CheckMailbox\bin\Debug

     目录          0  2009-04-04 10:51  CheckMailbox\CheckMailbox\obj\Debug

     目录          0  2009-04-04 10:51  CheckMailbox\CheckMailbox\Properties

     目录          0  2009-04-04 10:51  CheckMailbox\CheckMailbox\bin

     目录          0  2009-04-04 10:51  CheckMailbox\CheckMailbox\obj

     目录          0  2009-04-04 10:51  CheckMailbox\CheckMailbox

     目录          0  2009-04-04 10:51  CheckMailbox

............此处省略3个文件信息