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grassdragon_china@yahoo.com.cn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:lion-a@sohu.com lion.net@163.com

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

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: lion-a@sohu.com

Support .Net Framework Beta 2

*/

#region ASPNetPager Server Control

///

/// 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

///

public class SmtpMail

{

private string enter="\r\n";

///

/// 设定语言代码，默认设定为GB2312，如不需要可设置为""

///

private string _charset="GB2312";

///

/// 发件人地址

///

private string _from="";

///

/// 发件人姓名

///

private string _fromName="";

///

/// 回复邮件地址

///

///public string ReplyTo="";

///

/// 收件人姓名

///

private string _recipientName="";

///

/// 收件人列表

///

private Hashtable Recipient=new Hashtable();

///

/// 邮件服务器域名

///

private string mailserver="";

///

/// 邮件服务器端口号

///

private int mailserverport=25;

///

/// SMTP认证时使用的用户名

///

private string username="";

///

/// SMTP认证时使用的密码

///

private string password="";

///

/// 是否需要SMTP验证

///

private bool ESmtp=false;

///

/// 是否HTML邮件

///

private bool _HTML=false;

///

/// 邮件附件列表

///

private IList Attachments;

///

/// 邮件发送优先级，可设置为"High","Normal","Low"或"1","3","5"

///

private string priority="Normal";

///

/// 邮件主题

///

private string _subject;

///

/// 邮件正文

///

private string _body;

///

/// 密送收件人列表

///

///private Hashtable RecipientBCC=new Hashtable();

///

/// 收件人数量

///

private int RecipientNum=0;

///

/// 最多收件人数量

///

private int recipientmaxnum=5;

///

/// 密件收件人数量

///

///private int RecipientBCCNum=0;

///

/// 错误消息反馈

///

private string errmsg;

///

/// TcpClient对象，用于连接服务器

///

private TcpClient tc;

///

/// NetworkStream对象

///

private NetworkStream ns;

///

/// 服务器交互记录

///

private string logs="";

///

/// SMTP错误代码哈希表

///

private Hashtable ErrCodeHT = new Hashtable();

///

/// SMTP正确代码哈希表

///

private Hashtable RightCodeHT = new Hashtable();

///

/// 初始化 类的新实例

///

public SmtpMail()

{

Attachments = new System.Collections.ArrayList();

}

#region Properties

///

/// 邮件主题

///

public string Subject

{

get

{

return this._subject;

}

set

{

this._subject = value;

}

}

///

/// 邮件正文

///

public string Body

{

get

{

return this._body;

}

set

{

this._body = value;

}

}

///

/// 发件人地址

///

public string From

{

get

{

return _from;

}

set

{

this._from = value;

}

}

///

/// 设定语言代码，默认设定为GB2312，如不需要可设置为""

///

public string Charset

{

get

{

return this._charset;

}

set

{

this._charset = value;

}

}

///

/// 发件人姓名

///

public string FromName

{

get

{

return this._fromName;

}

set

{

this._fromName = value;

}

}

///

/// 收件人姓名

///

public string RecipientName

{

get

{

return this._recipientName;

}

set

{

this._recipientName = value;

}

}

///

/// 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"

///

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;

}

}

}

}

///

/// 邮件服务器端口号

///

public int MailDomainPort

{

set

{

mailserverport=value;

}

}

///

/// SMTP认证时使用的用户名

///

public string MailServerUserName

{

set

{

if(value.Trim()!="")

{

username=value.Trim();

ESmtp=true;

}

else

{

username="";

ESmtp=false;

}

}

}

///

/// SMTP认证时使用的密码

///

public string MailServerPassword

{

set

{

password=value;

}

}

///

/// 邮件发送优先级，可设置为"High","Normal","Low"或"1","3","5"

///

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;

}

}

}

///

/// 是否HTML邮件

///

public bool HTML

{

get

{

return this._HTML;

}

set

{

this._HTML = value;

}

}

///

/// 错误消息反馈

///

public string ErrorMessage

{

get

{

return errmsg;

}

}

///

/// 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（lion-a@sohu.com），我将尽快查明

原因。

///

public string Logs

{

get

{

return logs;

}

}

///

/// 最多收件人数量

///

public int RecipientMaxNum

{

set

{

recipientmaxnum = value;

}

}

#endregion

#region Methods

///

/// 添加邮件附件

///

/// 附件绝对路径

public void AddAttachment(params string[] FilePath)

{

if(FilePath==null)

{

throw(new ArgumentNullException("FilePath"));

}

for(int i=0;i

{

Attachments.Add(FilePath[i]);

}

}

///

/// 添加一组收件人（不超过recipientmaxnum个），参数为字符串数组

///

/// 保存有收件人地址的字符串数组（不超过recipientmaxnum个）

public bool AddRecipient(params string[] Recipients)

{

if(Recipient==null)

{

Dispose();

throw(new ArgumentNullException("Recipients"));

}

for(int i=0;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;

}

///

/// 发送邮件方法，所有参数均通过属性设置。

///

public bool Send()

{

if(mailserver.Trim()=="")

{

throw(new ArgumentNullException("Recipient","必须指定SMTP服务器"));

}

return SendEmail();

}

///

/// 发送邮件方法

///

/// smtp服务器信息，如"username:password@www.smtpserver.com:25"，也可去掉部分次要信

息，如"www.smtpserver.com"

public bool Send(string smtpserver)

{

MailDomain=smtpserver;

return Send();

}

///

/// 发送邮件方法

///

/// smtp服务器信息，如"username:password@www.smtpserver.com:25"，也可去掉部分次要信

息，如"www.smtpserver.com"

/// 发件人mail地址

/// 发件人姓名

/// 收件人地址

/// 收件人姓名

/// 是否HTML邮件

/// 邮件主题

/// 邮件正文

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

///

/// 添加一个收件人

///

/// 收件人地址

private bool AddRecipient(string Recipients)

{

if(RecipientNum

{

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();

}

///

/// SMTP回应代码哈希表

///

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");

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");

RightCodeHT.Add("354","开始邮件输入，以.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");

}

///

/// 将字符串编码为Base64字符串

///

/// 要编码的字符串

private string Base64Encode(string str)

{

byte[] barray;

barray=Encoding.Default.GetBytes(str);

return Convert.ToBase64String(barray);

}

///

/// 将Base64字符串解码为普通字符串

///

/// 要解码的字符串

private string Base64Decode(string str)

{

byte[] barray;

barray=Convert.FromBase64String(str);

return Encoding.Default.GetString(barray);

}

///

/// 得到上传附件的文件流

///

/// 附件的绝对路径

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));

}

///

/// 发送SMTP命令

///

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;

}

///

/// 接收SMTP服务器回应

///

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;

}

}

///

/// 与服务器交互，发送一条命令并接收回应。

///

/// 一个要发送的命令

/// 如果错误，要反馈的信息

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;

}

}

///

/// 与服务器交互，发送一组命令并接收回应。

///

private bool Dialog(string[] str,string errstr)

{

for(int i=0;i

{

if(!Dialog(str[i],""))

{

errmsg+=enter;

errmsg+=errstr;

return false;

}

}

return true;

}

///

/// SendEmail

///

///

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

{

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

{

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

{

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

{

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

/*

///

/// 添加一个密件收件人

///

/// 收件人地址

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;

}

}

///

/// 添加一组密件收件人（不超过10个），参数为字符串数组

///

/// 保存有收件人地址的字符串数组（不超过10个）

public bool AddRecipientBCC(string[] str)

{

for(int i=0;i

{

if(!AddRecipientBCC(str[i]))

{

return false;

}

}

return true;

}

*/

#endregion

}

#endregion

}