EMAIL发送系统介绍

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

/// <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: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>
/// 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（lion-a@sohu.com），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:password@www.smtpserver.com: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:password@www.smtpserver.com: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
}