c#发送需要smtp认证的邮件

答案：-------------------------调用类 -----------------------------------
private void SendMaill(string username,string superpassword,string email) {
   string body="尊敬的用户：<br><br>您好！<br><br>&nbsp;&nbsp;你的登录用户名是："+username+"这是你的超级密码:"+superpassword
    +"为了您的账号安全，我们建议您在收到邮件的72小时之内，到官方网站进行修改，并把该邮件删除。"
    +"<br><br>"
    +"　如有任何疑问，欢迎致电×××××发展有限责任公司客服热线：028-×××××××，我们将热情为您解答。"
    +"　感谢您的支持！<br><br>"
   +"&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;××××××发展有限责任公司<br><br>"
   +"&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"+System.DateTime.Now.Year+"年"+System.DateTime.Now.Month+"月"+System.DateTime.Now.Day+"日<br><br>" 
    +"&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;官网：http://www.×××××.com<br><br>"
    +"&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;××××：http://www.××××.com";
   
   lion_office.Data.Library.MailClass.ESmtpMail sm=new lion_office.Data.Library.MailClass.ESmtpMail();
   sm.Send("mail.××××.com",
     "×××@××××.com",
     "××客服",
     email,
     username,
    true,
    "×××官方网站密码找回邮件",
    body
        );

   Session.Remove("dd");
   Response.Redirect("FindSPassOK.aspx");
    }


-------------------------基类---------------------

using System; 
using System.Text; 
using System.IO; 
using System.Net; 
using System.Net.Sockets; 
using System.Collections; 

namespace lion_office.Data.Library.MailClass 
{ 
/*  
Create By lion  
2002-11-20 01:44  
Copyright (C) 2001,2002 www.LionSky.Net. All rights reserved. 
Web: http://www.Lionsky.net ;;
Email: lion-a@sohu.com 
Support .Net Framework Beta 2  
*/  
   public class ESmtpMail 
   { 
      private string enter="\r\n"; 
      /// <summary> 
      /// 设定语言代码，默认设定为GB2312，如不需要可设置为"" 
      /// </summary> 
      public string Charset="GB2312"; 
      /// <summary> 
      /// 发件人地址 
      /// </summary> 
      public string From=""; 
      /// <summary> 
      /// 发件人姓名 
      /// </summary> 
      public string FromName=""; 
      /// <summary> 
      /// 回复邮件地址 
      /// </summary> 
      //public string ReplyTo=""; 
      /// <summary> 
      /// 收件人姓名 
      /// </summary>    
      public string RecipientName=""; 
      /// <summary> 
      /// 收件人列表 
      /// </summary> 
      private Hashtable Recipient=new Hashtable(); 
      /// <summary> 
      /// 邮件服务器域名 
      /// </summary>    
      private string mailserver=""; 
      /// <summary> 
      /// 邮件服务器端口号 
      /// </summary>    
      private int mailserverport=25; 
      /// <summary> 
      /// SMTP认证时使用的用户名 
      /// </summary> 
      private string username=""; 
      /// <summary> 
      /// SMTP认证时使用的密码 
      /// </summary> 
      private string password=""; 
      /// <summary> 
      /// 是否需要SMTP验证 
      /// </summary>       
      private bool ESmtp=false; 
      /// <summary> 
      /// 是否Html邮件 
      /// </summary>       
      public bool Html=false; 
      /// <summary> 
      /// 邮件附件列表 
      /// </summary> 
      private System.Collections.ArrayList Attachments; 
      /// <summary> 
      /// 邮件发送优先级，可设置为"High","Normal","Low"或"1","3","5" 
      /// </summary> 
      private string priority="Normal"; 
      /// <summary> 
      /// 邮件主题 
      /// </summary>       
      public string Subject=""; 
      /// <summary> 
      /// 邮件正文 
      /// </summary>       
      public string Body=""; 
      /// <summary> 
      /// 收件人数量 
      /// </summary> 
      private int RecipientNum=0; 
      /// <summary> 
      /// 最多收件人数量 
      /// </summary> 
      private int recipientmaxnum=1; 
      /// <summary> 
      /// 密件收件人数量 
      /// </summary> 
      //private int RecipientBCCNum=0; 
      /// <summary> 
      /// 错误消息反馈 
      /// </summary> 
      private string errmsg; 
      /// <summary> 
      /// TcpClient对象，用于连接服务器 
      /// </summary>    
      private TcpClient tc; 
      /// <summary> 
      /// NetworkStream对象 
      /// </summary>    
      private NetworkStream ns; 
      /// <summary> 
      /// SMTP错误代码哈希表 
      /// </summary> 
      private Hashtable ErrCodeHT = new Hashtable(); 
      /// <summary> 
      /// SMTP正确代码哈希表 
      /// </summary> 
      private Hashtable RightCodeHT = new Hashtable(); 
      public ESmtpMail() 
      { 
         Attachments = new System.Collections.ArrayList(); 
      }       
      /// <summary> 
      /// 邮件服务器域名和验证信息 
      /// 形如："user:paswww.server.com:25"，也可省略次要信息。如"user:paswww.server.com"www.server.com" 
      /// </summary>    
      public string MailDomain 
      { 
         set 
         { 
            string maidomain=value.Trim(); 
            int tempint; 

            if(maidomain!="") 
            { 
               tempint=maidomain.IndexOf("@"); 
               if(tempint!=-1) 
               { 
                  string str=maidomain.Substring(0,tempint); 
                  MailServerUserName=str.Substring(0,str.IndexOf

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