EMAIL发送系统(C#+基于SMTP认证) 2.0

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这个是对于

EMAIL发送系统(C#+基于SMTP认证) 1.0

的改版这个第一版是2002年11月写的,过了一年半了,才有人提意见,就修正了一下,因为后来做的项目一直用不上,也就没有注意到

前段时间有网友反馈了一些问题,这次主要做了一些修正

1,text模式下发往163的邮件内容不见了
2,如果用outlook接收而不是在网上看邮件的话,会发现正文内容,但其后跟着一些乱码.
3,一些新开通的邮箱收到的是乱码,如*@126.com
4,修正了带附件的邮件,打开附件时内容混乱的问题

感谢 Lion互动网络论坛 的smhy8187和邮箱是[email protected]的朋友提供意见

欢迎大家提出修改建议,[注:]最好能把修改稿Mail给我一份,我们共同学习
我的Email:[email protected]     [email protected]


------------------------------------------

源码下载:点击下载

以下是程序源码:

 

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

namespace Lion.Web.Mail
{
 /* 
 Create By lion 
 2004-04-23 19:00 
 Copyright (C) 2001,2002 www.LionSky.Net. All rights reserved.
 Web: http://www.Lionsky.net ;;
 Email: [email protected]
 Support .Net Framework Beta 2 
 */ 
 #region AspNetPager Server Control

 /// <summary>
 /// 邮件可以通过 Microsoft Windows 2000 中内置的 SMTP 邮件服务或任意 SMTP 服务器来传送
 /// </summary>
 public class SmtpMail
 {

  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>
  private string _charset="GB2312";

  /// <summary>
  /// 发件人地址
  /// </summary>
  private string _from="";

  /// <summary>
  /// 发件人姓名
  /// </summary>
  private string _fromName="";

  /// <summary>
  /// 回复邮件地址
  /// </summary>
  ///public string ReplyTo="";

  /// <summary>
  /// 收件人姓名
  /// </summary> 
  private 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>  
  private bool _html=false;


  /// <summary>
  /// 邮件附件列表
  /// </summary>
  private IList 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>  
  private string _subject;

  /// <summary>
  /// 邮件正文
  /// </summary>  
  private string _body;
       
  /// <summary>
  /// 密送收件人列表
  /// </summary>
  ///private Hashtable RecipientBCC=new Hashtable();

  /// <summary>
  /// 收件人数量
  /// </summary>
  private int RecipientNum=0;

  /// <summary>
  /// 最多收件人数量
  /// </summary>
  private int recipientmaxnum=5;

  /// <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>
  /// 服务器交互记录
  /// </summary>
  private string logs="";

  /// <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();
  

  /// <summary>
  /// 初始化 <see cref="Lion.Web.Mail.SmtpMail"/> 类的新实例
  /// </summary>
  public SmtpMail()
  {
   Attachments = new System.Collections.ArrayList();
  }

  #region Properties


  /// <summary>
  /// 邮件主题
  /// </summary>
  public string Subject
  {
   get
   {
    return this._subject;
   }
   set
   {
    this._subject = value;
   }
  }

  /// <summary>
  /// 邮件正文
  /// </summary>
  public string Body
  {
   get
   {
    return this._body;
   }
   set
   {
    this._body = value;
   }
  }

  
  /// <summary>
  /// 发件人地址
  /// </summary>
  public string From
  {
   get
   {
    return _from;
   }
   set
   {
    this._from = value;
   }
  }

  /// <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
  {
   get
   {
    return this._charset;
   }
   set
   {
    this._charset = value;
   }
  }

  /// <summary>
  /// 发件人姓名
  /// </summary>
  public string FromName
  {
   get
   {
    return this._fromName;
   }
   set
   {
    this._fromName = value;
   }
  }

  /// <summary>
  /// 收件人姓名
  /// </summary>
  public string RecipientName
  {
   get
   {
    return this._recipientName;
   }
   set
   {
    this._recipientName = value;
   }
  }
  
  /// <summary>
  /// 邮件服务器域名和验证信息
  /// 形如:"user:[email protected]:25",也可省略次要信息。如"user:[email protected]"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>
  ///  是否Html邮件
  /// </summary>
  public bool Html
  {
   get
   {
    return this._html;
   }
   set
   {
    this._html = value;
   }
  }


  /// <summary>
  /// 错误消息反馈
  /// </summary>  
  public string ErrorMessage
  {
   get
   {
    return errmsg;
   }
  }

  /// <summary>
  /// 服务器交互记录,如发现本组件不能使用的SMTP服务器,请将出错时的Logs发给我([email protected]),我将尽快查明

原因。
  /// </summary>
  public string Logs
  {
   get
   {
    return logs;
   }
  }

  /// <summary>
  /// 最多收件人数量
  /// </summary>
  public int RecipientMaxNum
  {
   set
   {
    recipientmaxnum = value;
   }
  }

  
  #endregion

  #region Methods


  /// <summary>
  /// 添加邮件附件
  /// </summary>
  /// <param name="FilePath">附件绝对路径</param>
  public void AddAttachment(params string[] FilePath)
  {
   if(FilePath==null)
   {
    throw(new ArgumentNullException("FilePath"));
   }
   for(int i=0;i<FilePath.Length;i++)
   {
    Attachments.Add(FilePath[i]);
   }
  }
  
  /// <summary>
  /// 添加一组收件人(不超过recipientmaxnum个),参数为字符串数组
  /// </summary>
  /// <param name="Recipients">保存有收件人地址的字符串数组(不超过recipientmaxnum个)</param> 
  public bool AddRecipient(params string[] Recipients)
  {
   if(Recipient==null)
   {
    Dispose();
    throw(new ArgumentNullException("Recipients"));
   }
   for(int i=0;i<Recipients.Length;i++)
   {
    string recipient = Recipients[i].Trim();
    if(recipient==String.Empty)
    {
     Dispose();
     throw(new ArgumentNullException("Recipients["+ i +"]"));
    }
    if(recipient.IndexOf("@")==-1)
    {
     Dispose();
     throw(new ArgumentException("Recipients.IndexOf(\"@\")==-1","Recipients"));
    }
    if(!AddRecipient(recipient))
    {
     return false;
    }
   }
   return true;
  }

  /// <summary>
  /// 发送邮件方法,所有参数均通过属性设置。
  /// </summary>
  public bool Send()
  {
   if(mailserver.Trim()=="")
   {
    throw(new ArgumentNullException("Recipient","必须指定SMTP服务器"));
   }

   return SendEmail();
   
  }


  /// <summary>
  /// 发送邮件方法
  /// </summary>
  /// <param name="smtpserver">smtp服务器信息,如"username:[email protected]:25",也可去掉部分次要信

息,如"www.smtpserver.com"</param>
  public bool Send(string smtpserver)
  {   
   MailDomain=smtpserver;
   return Send();
  }


  /// <summary>
  /// 发送邮件方法
  /// </summary>
  /// <param name="smtpserver">smtp服务器信息,如"username:[email protected]:25",也可去掉部分次要信

息,如"www.smtpserver.com"</param>
  /// <param name="from">发件人mail地址</param>
  /// <param name="fromname">发件人姓名</param>
  /// <param name="to">收件人地址</param>
  /// <param name="toname">收件人姓名</param>
  /// <param name="html">是否HTML邮件</param>
  /// <param name="subject">邮件主题</param>
  /// <param name="body">邮件正文</param>
  public bool Send(string smtpserver,string from,string fromname,string to,string toname,bool html,string

subject,string body)
  {
   MailDomain=smtpserver;
   From=from;
   FromName=fromname;
   AddRecipient(to);
   RecipientName=toname;
   Html=html;
   Subject=subject;
   Body=body;
   return Send();
  }
  

  #endregion

  #region Private Helper Functions

  /// <summary>
  /// 添加一个收件人
  /// </summary> 
  /// <param name="Recipients">收件人地址</param>
  private bool AddRecipient(string Recipients)
  {
   if(RecipientNum<recipientmaxnum)
   {
    Recipient.Add(RecipientNum,Recipients);
    RecipientNum++;    
    return true;
   }
   else
   {
    Dispose();
    throw(new ArgumentOutOfRangeException("Recipients","收件人过多不可多于 "+ recipientmaxnum  +"

个"));
   }
  }

  void Dispose()
  {
   if(ns!=null)ns.Close();
   if(tc!=null)tc.Close();
  }

  /// <summary>
  /// SMTP回应代码哈希表
  /// </summary>
  private void SMTPCodeAdd()
  {
   ErrCodeHT.Add("500","邮箱地址错误");
   ErrCodeHT.Add("501","参数格式错误");
   ErrCodeHT.Add("502","命令不可实现");
   ErrCodeHT.Add("503","服务器需要SMTP验证");
   ErrCodeHT.Add("504","命令参数不可实现");
   ErrCodeHT.Add("421","服务未就绪,关闭传输信道");
   ErrCodeHT.Add("450","要求的邮件操作未完成,邮箱不可用(例如,邮箱忙)");
   ErrCodeHT.Add("550","要求的邮件操作未完成,邮箱不可用(例如,邮箱未找到,或不可访问)");
   ErrCodeHT.Add("451","放弃要求的操作;处理过程中出错");
   ErrCodeHT.Add("551","用户非本地,请尝试<forward-path>");
   ErrCodeHT.Add("452","系统存储不足,要求的操作未执行");
   ErrCodeHT.Add("552","过量的存储分配,要求的操作未执行");
   ErrCodeHT.Add("553","邮箱名不可用,要求的操作未执行(例如邮箱格式错误)");
   ErrCodeHT.Add("432","需要一个密码转换");
   ErrCodeHT.Add("534","认证机制过于简单");
   ErrCodeHT.Add("538","当前请求的认证机制需要加密");
   ErrCodeHT.Add("454","临时认证失败");
   ErrCodeHT.Add("530","需要认证");

   RightCodeHT.Add("220","服务就绪");
   RightCodeHT.Add("250","要求的邮件操作完成");
   RightCodeHT.Add("251","用户非本地,将转发向<forward-path>");
   RightCodeHT.Add("354","开始邮件输入,以<enter>.<enter>结束");
   RightCodeHT.Add("221","服务关闭传输信道");
   RightCodeHT.Add("334","服务器响应验证Base64字符串");
   RightCodeHT.Add("235","验证成功");
  }


  /// <summary>
  /// 将字符串编码为Base64字符串
  /// </summary>
  /// <param name="str">要编码的字符串</param>
  private string Base64Encode(string str)
  {
   byte[] barray;
   barray=Encoding.Default.GetBytes(str);
   return Convert.ToBase64String(barray);
  }


  /// <summary>
  /// 将Base64字符串解码为普通字符串
  /// </summary>
  /// <param name="str">要解码的字符串</param>
  private string Base64Decode(string str)
  {
   byte[] barray;
   barray=Convert.FromBase64String(str);
   return Encoding.Default.GetString(barray);
  }

  
  /// <summary>
  /// 得到上传附件的文件流
  /// </summary>
  /// <param name="FilePath">附件的绝对路径</param>
  private string GetStream(string FilePath)
  {
   //建立文件流对象
   System.IO.FileStream FileStr=new System.IO.FileStream(FilePath,System.IO.FileMode.Open);
   byte[] by=new byte[System.Convert.ToInt32(FileStr.Length)];
   FileStr.Read(by,0,by.Length);
   FileStr.Close();
   return(System.Convert.ToBase64String(by));
  }

  /// <summary>
  /// 发送SMTP命令
  /// </summary> 
  private bool SendCommand(string str)
  {
   byte[]  WriteBuffer;
   if(str==null||str.Trim()==String.Empty)
   {
    return true;
   }
   logs+=str;
   WriteBuffer = Encoding.Default.GetBytes(str);
   try
   {
    ns.Write(WriteBuffer,0,WriteBuffer.Length);
   }
   catch
   {
    errmsg="网络连接错误";
    return false;
   }
   return true;
  }

  /// <summary>
  /// 接收SMTP服务器回应
  /// </summary>
  private string RecvResponse()
  {
   int StreamSize;
   string ReturnValue = String.Empty;
   byte[]  ReadBuffer = new byte[1024] ;
   try
   {
    StreamSize=ns.Read(ReadBuffer,0,ReadBuffer.Length);
   }
   catch
   {
    errmsg="网络连接错误";
    return "false";
   }

   if (StreamSize==0)
   {
    return ReturnValue ;
   }
   else
   {
    ReturnValue = Encoding.Default.GetString(ReadBuffer).Substring(0,StreamSize);
    logs+=ReturnValue+this.enter;
    return  ReturnValue;
   }
  }

  /// <summary>
  /// 与服务器交互,发送一条命令并接收回应。
  /// </summary>
  /// <param name="str">一个要发送的命令</param>
  /// <param name="errstr">如果错误,要反馈的信息</param>
  private bool Dialog(string str,string errstr)
  {
   if(str==null||str.Trim()=="")
   {
    return true;
   }
   if(SendCommand(str))
   {
    string RR=RecvResponse();
    if(RR=="false")
    {
     return false;
    }
    string RRCode=RR.Substring(0,3);
    if(RightCodeHT[RRCode]!=null)
    {
     return true;
    }
    else
    {
     if(ErrCodeHT[RRCode]!=null)
     {
      errmsg+=(RRCode+ErrCodeHT[RRCode].ToString());
      errmsg+=enter;
     }
     else
     {
      errmsg+=RR;
     }
     errmsg+=errstr;
     return false;
    }
   }
   else
   {
    return false;
   }

  }


  /// <summary>
  /// 与服务器交互,发送一组命令并接收回应。
  /// </summary>

  private bool Dialog(string[] str,string errstr)
  {
   for(int i=0;i<str.Length;i++)
   {
    if(!Dialog(str[i],""))
    {
     errmsg+=enter;
     errmsg+=errstr;
     return false;
    }
   }

   return true;
  }

  /// <summary>
  /// SendEmail
  /// </summary>
  /// <returns></returns>
  private bool SendEmail()
  {
   //连接网络
   try
   {
    tc=new TcpClient(mailserver,mailserverport);
   }
   catch(Exception e)
   {
    errmsg=e.ToString();
    return false;
   }

   ns = tc.GetStream();
   SMTPCodeAdd();

   //验证网络连接是否正确
   if(RightCodeHT[RecvResponse().Substring(0,3)]==null)
   {
    errmsg="网络连接失败";
    return false;
   }


   string[] SendBuffer;
   string SendBufferstr;

   //进行SMTP验证
   if(ESmtp)
   {
    SendBuffer=new String[4];
    SendBuffer[0]="EHLO " + mailserver + enter;
    SendBuffer[1]="AUTH LOGIN" + enter;
    SendBuffer[2]=Base64Encode(username) + enter;
    SendBuffer[3]=Base64Encode(password) + enter;
    if(!Dialog(SendBuffer,"SMTP服务器验证失败,请核对用户名和密码。"))
     return false;
   }
   else
   {
    SendBufferstr="HELO " + mailserver + enter;
    if(!Dialog(SendBufferstr,""))
     return false;
   }

   //
   SendBufferstr="MAIL FROM:<" + From + ">" + enter;
   if(!Dialog(SendBufferstr,"发件人地址错误,或不能为空"))
    return false;

   //
   SendBuffer=new string[recipientmaxnum];
   for(int i=0;i<Recipient.Count;i++)
   {
    SendBuffer[i]="RCPT TO:<" + Recipient[i].ToString() +">" + enter;

   }
   if(!Dialog(SendBuffer,"收件人地址有误"))
    return false;

   /*
      SendBuffer=new string[10];
      for(int i=0;i<RecipientBCC.Count;i++)
      {

       SendBuffer[i]="RCPT TO:<" + RecipientBCC[i].ToString() +">" + enter;

      }

      if(!Dialog(SendBuffer,"密件收件人地址有误"))
       return false;
   */
   SendBufferstr="DATA" + enter;
   if(!Dialog(SendBufferstr,""))
    return false;

   SendBufferstr="From:" + FromName + "<" + From +">" +enter;

   //if(ReplyTo.Trim()!="")
   //{
   // SendBufferstr+="Reply-To: " + ReplyTo + enter;
   //}

   //SendBufferstr+="To:" + RecipientName + "<" + Recipient[0] +">" +enter;
   SendBufferstr += "To:=?"+Charset.ToUpper()+"?B?"+Base64Encode(RecipientName)+"?="+"<"+Recipient[0]

+">"+enter;
   
   SendBufferstr+="CC:";
   for(int i=0;i<Recipient.Count;i++)
   {
    SendBufferstr+=Recipient[i].ToString() + "<" + Recipient[i].ToString() +">,";
   }
   SendBufferstr+=enter;

   SendBufferstr+=((Subject==String.Empty || Subject==null)?"Subject:":((Charset=="")?("Subject:" +

Subject):("Subject:" + "=?" + Charset.ToUpper() + "?B?" + Base64Encode(Subject) +"?="))) + enter;
   SendBufferstr+="X-Priority:" + priority + enter;
   SendBufferstr+="X-MSMail-Priority:" + priority + enter;
   SendBufferstr+="Importance:" + priority + enter;
   SendBufferstr+="X-Mailer: Lion.Web.Mail.SmtpMail Pubclass [cn]" + enter;
   SendBufferstr+="MIME-Version: 1.0" + enter;
   if(Attachments.Count!=0)
   {
    SendBufferstr+="Content-Type: multipart/mixed;" + enter;
    SendBufferstr += " boundary=\"====="+

(Html?"001_Dragon520636771063_":"001_Dragon303406132050_")+"=====\""+enter+enter;
   }

   if(Html)
   {
    if(Attachments.Count==0)
    {
     SendBufferstr += "Content-Type: multipart/alternative;"+enter;//内容格式和分隔符
     SendBufferstr += " boundary=\"=====003_Dragon520636771063_=====\""+enter+enter;

     SendBufferstr += "This is a multi-part message in MIME format."+enter+enter;
    }
    else
    {
     SendBufferstr +="This is a multi-part message in MIME format."+enter+enter;
     SendBufferstr += "--=====001_Dragon520636771063_====="+enter;
     SendBufferstr += "Content-Type: multipart/alternative;"+enter;//内容格式和分隔符
     SendBufferstr += " boundary=\"=====003_Dragon520636771063_=====\""+enter+enter; 

    
    }
    SendBufferstr += "--=====003_Dragon520636771063_====="+enter;
    SendBufferstr += "Content-Type: text/plain;"+ enter;
    SendBufferstr += ((Charset=="")?(" charset=\"iso-8859-1\""):(" charset=\"" +

Charset.ToLower() + "\"")) + enter;
    SendBufferstr+="Content-Transfer-Encoding: base64" + enter + enter;
    SendBufferstr+= Base64Encode("邮件内容为HTML格式,请选择HTML方式查看") + enter + enter;

    SendBufferstr += "--=====003_Dragon520636771063_====="+enter;

    

    SendBufferstr+="Content-Type: text/html;" + enter;
    SendBufferstr+=((Charset=="")?(" charset=\"iso-8859-1\""):(" charset=\"" +

Charset.ToLower() + "\"")) + enter;
    SendBufferstr+="Content-Transfer-Encoding: base64" + enter + enter;
    SendBufferstr+= Base64Encode(Body) + enter + enter;
    SendBufferstr += "--=====003_Dragon520636771063_=====--"+enter;
   }
   else
   {
    if(Attachments.Count!=0)
    {
     SendBufferstr += "--=====001_Dragon303406132050_====="+enter;
    }
    SendBufferstr+="Content-Type: text/plain;" + enter;
    SendBufferstr+=((Charset=="")?(" charset=\"iso-8859-1\""):(" charset=\"" +

Charset.ToLower() + "\"")) + enter;
    SendBufferstr+="Content-Transfer-Encoding: base64" + enter + enter;
    SendBufferstr+= Base64Encode(Body) + enter;
   }
   
   //SendBufferstr += "Content-Transfer-Encoding: base64"+enter;

   

   
   if(Attachments.Count!=0)
   {
    for(int i=0;i<Attachments.Count;i++)
    {
     string filepath = (string)Attachments[i];
     SendBufferstr += "--====="+

(Html?"001_Dragon520636771063_":"001_Dragon303406132050_") +"====="+enter;
     //SendBufferstr += "Content-Type: application/octet-stream"+enter;
     SendBufferstr += "Content-Type: text/plain;"+enter;
     SendBufferstr += " name=\"=?"+Charset.ToUpper()+"?B?"+Base64Encode

(filepath.Substring(filepath.LastIndexOf("\\")+1))+"?=\""+enter;
     SendBufferstr += "Content-Transfer-Encoding: base64"+enter;
     SendBufferstr += "Content-Disposition: attachment;"+enter;
     SendBufferstr += " filename=\"=?"+Charset.ToUpper()+"?B?"+Base64Encode

(filepath.Substring(filepath.LastIndexOf("\\")+1))+"?=\""+enter+enter;
     SendBufferstr += GetStream(filepath)+enter+enter;
    }
    SendBufferstr += "--====="+ (Html?"001_Dragon520636771063_":"001_Dragon303406132050_")

+"=====--"+enter+enter;
   }
   
   
   
   SendBufferstr += enter + "." + enter;

   if(!Dialog(SendBufferstr,"错误信件信息"))
    return false;


   SendBufferstr="QUIT" + enter;
   if(!Dialog(SendBufferstr,"断开连接时错误"))
    return false;


   ns.Close();
   tc.Close();
   return true;
  }


  #endregion

  #region
  /*
  /// <summary>
  /// 添加一个密件收件人
  /// </summary>
  /// <param name="str">收件人地址</param>
  public bool AddRecipientBCC(string str)
  {
   if(str==null||str.Trim()=="")
    return true;
   if(RecipientBCCNum<10)
   {
    RecipientBCC.Add(RecipientBCCNum,str);
    RecipientBCCNum++;
    return true;
   }
   else
   {
    errmsg+="收件人过多";
    return false;
   }
  }


  /// <summary>
  /// 添加一组密件收件人(不超过10个),参数为字符串数组
  /// </summary> 
  /// <param name="str">保存有收件人地址的字符串数组(不超过10个)</param>
  public bool AddRecipientBCC(string[] str)
  {
   for(int i=0;i<str.Length;i++)
   {
    if(!AddRecipientBCC(str[i]))
    {
     return false;
    }
   }
   return true;
  }

  */   
  #endregion 
 }

 #endregion
}


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