向广大C#爱好者推荐一个很好使的MAIL CLASS

答案：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:pass@www.server.com:25"，也可省略次要信息。如"user:pass@www.server.com"或"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(":")); 
                  MailServerPassWord=str.Substring(str.IndexOf(":")+1,str.Length-str.IndexOf(":")-1); 
                  maidomain=maidomain.Substring(tempint+1,maidomain.Length-tempint-1); 
               } 

               tempint=maidomain.IndexOf(":"); 
               if(tempint!=-1) 
               { 
                  mailserver=maidomain.Substring(0,tempint); 
                  mailserverport=System.Convert.ToInt32(maidomain.Substring(tempint+1,maidomain.Length-tempint-1)); 
               } 
               else 
               { 
                  mailserver=maidomain; 

               } 

                
            } 

         } 
      } 

 

      /// <summary> 
      /// 邮件服务器端口号 
      /// </summary>    
      public int MailDomainPort 
      { 
         set 
         { 
            mailserverport=value; 
         } 
      } 

 

      /// <summary> 
      /// SMTP认证时使用的用户名 
      /// </summary> 
      public string MailServerUserName 
      { 
         set 
         { 
            if(value.Trim()!="") 
            { 
               username=value.Trim(); 
               ESmtp=true; 
            } 
            else 
            { 
               username=""; 
               ESmtp=false; 
            } 
         } 
      } 

      /// <summary> 
      /// SMTP认证时使用的密码 
      /// </summary> 
      public string MailServerPassWord 
      { 
         set 
         { 
            password=value; 
         } 
      }    

      /// <summary> 
      /// 邮件发送优先级，可设置为"High","Normal","Low"或"1","3","5" 
      /// </summary> 
      public string Priority 
      { 
         set 
         { 
            switch(value.ToLower()) 
            { 
               case "high": 
                  priority="High"; 
                  break; 

               case "1": 
                  priority="High"; 
                  break; 

               case "normal": 
                  priority="Normal"; 
                  break; 

               case "3": 
                  priority="Normal"; 
                  break; 

               case "low": 
                  priority="Low"; 
                  break; 

               case "5": 
                  priority="Low"; 
                  break; 

               default: 
                  priority="Normal"; 
                  break; 
            } 
         } 
      } 


      /// <summary> 
      /// 错误消息反馈 
      /// </summary>       
      public string ErrorMessage 
      { 
         get 
         { 
         

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