发布源码：高效的Esmtp,带验证，用Socket编写

using System;
using System.Net;
using System.Net.Sockets;
using System.Collections;
using System.Configuration;
using System.Text;
using System.XML;
using System.IO;
using System.Web;
using System.Web.Mail;namespace mail
{
/// <summary>
/// Class1 的摘要说明。
/// </summary>
public class mSendMail
{
  private TcpClient tcpClt;
  private NetworkStream networkStm;
  private Hashtable rightCodeHT = new Hashtable();
  private string smtpServerName;
  private int smtpServerPort;
  private string userName;
  private string passWord;
  private string to;
  private string from;
  private string fromName;
  private string charset;
  private string recipientName;
  private string subject;
  private string body;
  private string priority;

  static string Send_Method;

  public mSendMail()
  {

  }  public mSendMail(string strToName,string strTo,string strBody)
  {
   to = strTo;
   recipientName = strToName;
   body = strBody;
   smtpCodeAdd();
  }
  public mSendMail(string strToName,string strTo, string strSubject, string strBody)
  {
   to = strTo;
   recipientName = strToName;
   subject = strSubject;
   body = strBody;
   smtpCodeAdd();
  }
  public mSendMail(string strToName,string strTo,string strFromName,string strFrom, string strSubject, string strBody)
  {
   to = strTo;
   recipientName = strToName;
   from = strFrom;
   fromName = strFromName;
   subject = strSubject;
   body = strBody;
   smtpCodeAdd();
  }
  private bool initialize()
  {
   try
   {
    if(Send_Method=="1")
    {
     smtpServerName = ConfigurationSettings.AppSettings["smtpServerName"];
     smtpServerPort = Convert.ToInt32(ConfigurationSettings.AppSettings["smtpServerPort"]);
     userName = ConfigurationSettings.AppSettings["userName"];
     password = ConfigurationSettings.AppSettings["password"];
     //from = ConfigurationSettings.AppSettings["from"];
     //fromName = ConfigurationSettings.AppSettings["fromName"];
     charset = ConfigurationSettings.AppSettings["charset"];
    }
    else
    {
     smtpServerName ="";//your smtp server
     smtpServerPort =25;
     userName ="";//your name
     password ="";//your pass
     charset ="GB2312";
     //from = ConfigurationSettings.AppSettings["from"];
     //fromName = ConfigurationSettings.AppSettings["fromName"];
    }


   }
   catch
   {
    return false;
   }
   priority = "Normal";
   //subject = "//";
   //smtpCodeAdd();
   return true;
  }  private string Base64Encode(string str)
  {
   byte[] barray;
   barray=Encoding.Default.GetBytes(str);
   return Convert.ToBase64String(barray);
  }  private void smtpCodeAdd()
  {
   rightCodeHT.Add("220","");
   rightCodeHT.Add("250","");
   rightCodeHT.Add("251","");
   rightCodeHT.Add("354","");
   rightCodeHT.Add("221","");
   rightCodeHT.Add("334","");
   rightCodeHT.Add("235","");
  }  private bool sendCommand(string str)
  {
   byte[] writeBuffer;
   writeBuffer = Encoding.Default.GetBytes(str);
   try
   {
    networkStm.Write(writeBuffer, 0, writeBuffer.Length);
   }
   catch
   {
    return false;
   }
   return true;
  }  private bool isRight()
  {
   int streamSize;
   byte[] readBuffer = new byte[1024];
   string returnValue = "";
   try
   {
    streamSize = networkStm.Read(readBuffer, 0, readBuffer.Length);
   }
   catch
   {
    return false;
   }
   if (streamSize != 0)
    returnValue = Encoding.Default.GetString(readBuffer, 0, streamSize);
   if(rightCodeHT[returnValue.Substring(0,3)] == null)
    return false;
   return true;
  }  public bool sendMail()
  {
   if (!initialize())
    return false;
   try
   {
    tcpClt = new TcpClient(smtpServerName, smtpServerPort);
   }
   catch
   {
    return false;
   }
   networkStm = tcpClt.GetStream();
   if (!isRight())
    return false;
   string[] sendBuffer;
   string enter = "\r\n";   sendBuffer = new String[9];
   sendBuffer[0] = "EHLO " + smtpServerName + enter;
   sendBuffer[1] = "AUTH LOGIN" + enter;
   sendBuffer[2] = Base64Encode(userName) + enter;
   sendBuffer[3] = Base64Encode(password) + enter;
   sendBuffer[4] = "MAIL FROM:<" + from + ">" + enter;
   sendBuffer[5] = "RCPT TO:<" + to +">" + enter;
   sendBuffer[6] = "DATA" + enter;
   sendBuffer[7] = "From:" + fromName + "<" + from +">" + enter;
   sendBuffer[7] += "To:=?" + charset.ToUpper() + "?B?"
    + Base64Encode(recipientName) + "?=" + "<" + to + ">" + enter;
   sendBuffer[7] += "Subject:" + "=?" + charset.ToUpper() + "?B?"
    + Base64Encode(subject) + "?=" + enter;
   sendBuffer[7] += "X-Priority:" + priority + enter;
   sendBuffer[7] += "X-MSMail-Priority:" + priority + enter;
   sendBuffer[7] += "Importance:" + priority + enter;
   sendBuffer[7] += "X-Mailer: Huolx.Pubclass" + enter;
   sendBuffer[7] += "MIME-Version: 1.0" + enter;
   sendBuffer[7] += "Content-Type: multipart/mixed;" + enter;
   sendBuffer[7] += "   boundary=\"----=_NextPart_000_00D6_01C29593.AAB31770\"" + enter;
   sendBuffer[7] += "------=_NextPart_000_00D6_01C29593.AAB31770" + enter;
   sendBuffer[7] += "Content-Type: text/Html;" + enter;
   sendBuffer[7] += "   charset=\"" + charset.ToLower() + "\"" + enter;
   sendBuffer[7] += "Content-Transfer-Encoding: base64" + enter + enter;
   sendBuffer[7] += Base64Encode(body) + enter;
   sendBuffer[7] += "------=_NextPart_000_00D6_01C29593.AAB31770--" + enter + enter;
   sendBuffer[7] += enter + "." + enter;
   sendBuffer[8] = "QUIT" + enter;   int i;   for (i=0;i<sendBuffer.Length;i++)
   {
    if (!sendCommand(sendBuffer[i]))
     return false;
    if (!isRight())
     return false;
   }
   tcpClt.Close();
   networkStm.Close();   return true;
  }
  public int Send_Email(string From, string To,string FromName,string ToName,string Subject,string Body)
  {
      int IsSUCcess = 0;
   string s1=To;
   int ix;
   int iy;
   int iz;
   char split;
   split=',';
   string[] MailAddress;

   ix=To.LastIndexOf("@");
   iy=To.LastIndexOf(".");
   iz=To.LastIndexOf(",");   if (ix>0 && iy>0 && iy>ix)
   {
    if (iz>0)
    {
     MailAddress=s1.Split(split);
     for(int i=0;i<MailAddress.Length;i++)
     {
      ix=MailAddress[i].LastIndexOf("@");
      if (MailAddress[i].Substring(ix+1)=="sina.com")
      {Send_Method="1";}
      else{Send_Method="0";}

      mSendMail mySendMail = new mSendMail(ToName,MailAddress[i],FromName,From,Subject,Body);
      try
      {
       if (mySendMail.sendMail()== true)
        IsSuccess = 0;
      }
      catch
      {

      }

     }
    }
    else
    {
     if (s1.Substring(ix+1)=="sina.com")
     {Send_Method="1";}
     else{Send_Method="0";}

     mSendMail mySendMail = new mSendMail(ToName,To,FromName,From,Subject,Body);
     try
     {
      if (mySendMail.sendMail()== true)
       IsSuccess = 0;
     }
     catch
     {}

    }
   }
   else{IsSuccess=2;}
   return IsSuccess;
  }
  public int Send_TuiJian(string From, string To,string FromName,string ToName,string Title,string NewsAddr,string Message)
  {
   //读取邮件内容
   string MessagePath;
   if(System.Configuration.ConfigurationSettings.AppSettings["MessagePath"] != null)
    MessagePath = System.Configuration.ConfigurationSettings.AppSettings["MessagePath"].ToString();
   else
    MessagePath = @"D:\abc.htm";
   string strTemplate;

   StreamReader stream = new StreamReader(MessagePath,System.Text.Encoding.GetEncoding("GB2312"));
   try
   {

    stream.BaseStream.Seek(0,SeekOrigin.Begin);
    strTemplate = stream.ReadToEnd();
    strTemplate.Replace("\"","'");
   }
   finally
   {
    stream.Close();
   }   //替换
   string tmpMessage = Message;
   try
   {
    for (int i=0; i<=(Message.Length/35); i++)
    {
     tmpMessage = tmpMessage.Insert((i+1)*35,"<br>");
    }
   }
   catch
   {
   }
   Message = tmpMessage;
   Message = Message + "<br>";
   strTemplate = strTemplate.Insert(strTemplate.LastIndexOf("此致，礼"),Message);
   strTemplate = strTemplate.Replace("aa",ToName);
   strTemplate = strTemplate.Replace("bb",FromName);
   strTemplate = strTemplate.Replace("cc",Title);
   strTemplate = strTemplate.Replace(@"dd",NewsAddr);
   strTemplate = strTemplate.Replace("1980年",DateTime.Now.ToShortDateString());   //发送邮件
   int IsSuccess = 0;
   string Subject = "想请你去看看";

   //邮件地址判定
   string s1=To;
   int ix;
   int iy;
   int iz;
   char split;
   split=',';
   string[] MailAddress;

   ix=To.LastIndexOf("@");
   iy=To.LastIndexOf(".");
   iz=To.LastIndexOf(",");
   if (ix>0 && iy>0 && iy>ix)
   {
    if (iz>0)
    {
     MailAddress=s1.Split(split);
     for(int i=0;i<MailAddress.Length;i++)
     {
      ix=MailAddress[i].LastIndexOf("@");
      if (MailAddress[i].Substring(ix+1)=="sina.com")
      {Send_Method="1";}
      else{Send_Method="0";}

      mSendMail mySendMail = new mSendMail(ToName,MailAddress[i],FromName,From,Subject,strTemplate);
      try
      {
       if (mySendMail.sendMail()== true)
        IsSuccess = 0;
      }
      catch
      {

      }

     }
    }
    else
    {
     if (s1.Substring(ix+1)=="sina.com")
     {Send_Method="1";}
     else{Send_Method="0";}

     mSendMail mySendMail = new mSendMail(ToName,To,FromName,From,Subject,strTemplate);
     try
     {
      if (mySendMail.sendMail()== true)
       IsSuccess = 0;
     }
     catch
     {}

    }
   }
   else{IsSuccess=2;}
   return IsSuccess;  }
}}