程式師世界 >> 編程語言 >> C語言 >> 關於C語言 >> EMAIL發送系統(C#+基於SMTP認證) 2.0

EMAIL發送系統(C#+基於SMTP認證) 2.0

編輯：關於C語言

這個是對於
EMAIL發送系統(C#+基於SMTP認證) 1.0

的改版這個第一版是2002年11月寫的，過了一年半了，才有人提意見，就修正了一下，因為後來做的項目一直用不上，也就沒有注意到

前段時間有網友反饋了一些問題，這次主要做了一些修正

1,text模式下發往163的郵件內容不見了
2,如果用outlook接收而不是在網上看郵件的話,會發現正文內容,但其後跟著一些亂碼.
3,一些新開通的郵箱收到的是亂碼，如*@126.com
4,修正了帶附件的郵件，打開附件時內容混亂的問題

感謝 Lion互動網絡論壇的smhy8187和郵箱是[email protected]的朋友提供意見

歡迎大家提出修改建議，[注：]最好能把修改稿Mail給我一份，我們共同學習
我的Email:[email protected] [email protected]

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

源碼下載：點擊下載

以下是程序源碼：

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>
/// 郵件可以通過 Microsoft Windows 2000 中內置的 SMTP 郵件服務或任意 SMTP 服務器來傳送
/// </summary>
public class SmtpMail
{

private string enter="\r\n";

/// <summary>
/// 設定語言代碼，默認設定為GB2312，如不需要可設置為""
/// </summary>
private string _charset="GB2312";

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

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

/// <summary>
/// 回復郵件地址
/// </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>
/// 郵件服務器域名
/// </summary>
private string mailserver="";

/// <summary>
/// 郵件服務器端口號
/// </summary>
private int mailserverport=25;

/// <summary>
/// SMTP認證時使用的用戶名
/// </summary>
private string username="";

/// <summary>
/// SMTP認證時使用的密碼
/// </summary>
private string passWord="";

/// <summary>
/// 是否需要SMTP驗證
/// </summary>
private bool ESmtp=false;

/// <summary>
/// 是否Html郵件
/// </summary>
private bool _Html=false;

/// <summary>
/// 郵件附件列表
/// </summary>
private IList Attachments;

/// <summary>
/// 郵件發送優先級，可設置為"High","Normal","Low"或"1","3","5"
/// </summary>
private string priority="Normal";

/// <summary>
/// 郵件主題
/// </summary>
private string _subject;

/// <summary>
/// 郵件正文
/// </summary>
private string _body;

/// <summary>
/// 密送收件人列表
/// </summary>
///private Hashtable RecipIEntBCC=new Hashtable();

/// <summary>
/// 收件人數量
/// </summary>
private int RecipIEntNum=0;

/// <summary>
/// 最多收件人數量
/// </summary>
private int recipIEntmaxnum=5;

/// <summary>
/// 密件收件人數量
/// </summary>
///private int RecipIEntBCCNum=0;

/// <summary>
/// 錯誤消息反饋
/// </summary>
private string errmsg;

/// <summary>
/// TcpClIEnt對象，用於連接服務器
/// </summary>
private TcpClIEnt tc;

/// <summary>
/// NetworkStream對象
/// </summary>
private NetworkStream ns;

/// <summary>
/// 服務器交互記錄
/// </summary>
private string logs="";

/// <summary>
/// SMTP錯誤代碼哈希表
/// </summary>
private Hashtable ErrCodeHT = new Hashtable();

/// <summary>
/// SMTP正確代碼哈希表
/// </summary>
private Hashtable RightCodeHT = new Hashtable();

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

#region PropertIEs

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

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

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

/// <summary>
/// 設定語言代碼，默認設定為GB2312，如不需要可設置為""
/// </summary>
public string Charset
{
get
{
return this._charset;
}
set
{
this._charset = value;
}
}

/// <summary>
/// 發件人姓名
/// </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>
/// 郵件服務器域名和驗證信息
/// 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>
/// 郵件服務器端口號
/// </summary>
public int MailDomainPort
{
set
{
mailserverport=value;
}
}

/// <summary>
/// SMTP認證時使用的用戶名
/// </summary>
public string MailServerUserName
{
set
{
if(value.Trim()!="")
{
username=value.Trim();
ESmtp=true;
}
else
{
username="";
ESmtp=false;
}
}
}

/// <summary>
/// SMTP認證時使用的密碼
/// </summary>
public string MailServerPassWord
{
set
{
passWord=value;
}
}

/// <summary>
/// 郵件發送優先級，可設置為"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郵件
/// </summary>
public bool Html
{
get
{
return this._Html;
}
set
{
this._Html = value;
}
}

/// <summary>
/// 錯誤消息反饋
/// </summary>
public string ErrorMessage
{
get
{
return errmsg;
}
}

/// <summary>
/// 服務器交互記錄，如發現本組件不能使用的SMTP服務器，請將出錯時的Logs發給我（[email protected]），我將盡快查明

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

/// <summary>
/// 最多收件人數量
/// </summary>
public int RecipIEntMaxNum
{
set
{
recipIEntmaxnum = value;
}
}

#endregion

#region Methods

/// <summary>
/// 添加郵件附件
/// </summary>
/// <param name="FilePath">附件絕對路徑</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>
/// 添加一組收件人（不超過recipIEntmaxnum個），參數為字符串數組
/// </summary>
/// <param name="Recipients">保存有收件人地址的字符串數組（不超過recipIEntmaxnum個）</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>
/// 發送郵件方法，所有參數均通過屬性設置。
/// </summary>
public bool Send()
{
if(mailserver.Trim()=="")
{
throw(new ArgumentNullException("RecipIEnt","必須指定SMTP服務器"));
}

return SendEmail();

}

/// <summary>
/// 發送郵件方法
/// </summary>
/// <param name="smtpserver">smtp服務器信息，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>
/// 發送郵件方法
/// </summary>
/// <param name="smtpserver">smtp服務器信息，如"username:[email protected]:25"，也可去掉部分次要信

息，如"www.smtpserver.com"</param>
/// <param name="from">發件人mail地址</param>
/// <param name="fromname">發件人姓名</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郵件</param>
/// <param name="subject">郵件主題</param>
/// <param name="body">郵件正文</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>
/// 添加一個收件人
/// </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","收件人過多不可多於 "+ recipIEntmaxnum +"

個"));
}
}

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

/// <summary>
/// SMTP回應代碼哈希表
/// </summary>
private void SMTPCodeAdd()
{
ErrCodeHT.Add("500","郵箱地址錯誤");
ErrCodeHT.Add("501","參數格式錯誤");
ErrCodeHT.Add("502","命令不可實現");
ErrCodeHT.Add("503","服務器需要SMTP驗證");
ErrCodeHT.Add("504","命令參數不可實現");
ErrCodeHT.Add("421","服務未就緒，關閉傳輸信道");
ErrCodeHT.Add("450","要求的郵件操作未完成，郵箱不可用（例如，郵箱忙）");
ErrCodeHT.Add("550","要求的郵件操作未完成，郵箱不可用（例如，郵箱未找到，或不可訪問）");
ErrCodeHT.Add("451","放棄要求的操作；處理過程中出錯");
ErrCodeHT.Add("551","用戶非本地，請嘗試<forward-path>");
ErrCodeHT.Add("452","系統存儲不足，要求的操作未執行");
ErrCodeHT.Add("552","過量的存儲分配，要求的操作未執行");
ErrCodeHT.Add("553","郵箱名不可用，要求的操作未執行（例如郵箱格式錯誤）");
ErrCodeHT.Add("432","需要一個密碼轉換");
ErrCodeHT.Add("534","認證機制過於簡單");
ErrCodeHT.Add("538","當前請求的認證機制需要加密");
ErrCodeHT.Add("454","臨時認證失敗");
ErrCodeHT.Add("530","需要認證");

RightCodeHT.Add("220","服務就緒");
RightCodeHT.Add("250","要求的郵件操作完成");
RightCodeHT.Add("251","用戶非本地，將轉發向<forward-path>");
RightCodeHT.Add("354","開始郵件輸入，以<enter>.<enter>結束");
RightCodeHT.Add("221","服務關閉傳輸信道");
RightCodeHT.Add("334","服務器響應驗證Base64字符串");
RightCodeHT.Add("235","驗證成功");
}

/// <summary>
/// 將字符串編碼為Base64字符串
/// </summary>
/// <param name="str">要編碼的字符串</param>
private string Base64Encode(string str)
{
byte[] barray;
barray=Encoding.Default.GetBytes(str);
return Convert.ToBase64String(barray);
}

/// <summary>
/// 將Base64字符串解碼為普通字符串
/// </summary>
/// <param name="str">要解碼的字符串</param>
private string Base64Decode(string str)
{
byte[] barray;
barray=Convert.FromBase64String(str);
return Encoding.Default.GetString(barray);
}

/// <summary>
/// 得到上傳附件的文件流
/// </summary>
/// <param name="FilePath">附件的絕對路徑</param>
private string GetStream(string FilePath)
{
//建立文件流對象
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>
/// 發送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="網絡連接錯誤";
return false;
}
return true;
}

/// <summary>
/// 接收SMTP服務器回應
/// </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="網絡連接錯誤";
return "false";
}

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

/// <summary>
/// 與服務器交互，發送一條命令並接收回應。
/// </summary>
/// <param name="str">一個要發送的命令</param>
/// <param name="errstr">如果錯誤，要反饋的信息</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>
/// 與服務器交互，發送一組命令並接收回應。
/// </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()
{
//連接網絡
try
{
tc=new TcpClIEnt(mailserver,mailserverport);
}
catch(Exception e)
{
errmsg=e.ToString();
return false;
}

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

//驗證網絡連接是否正確
if(RightCodeHT[RecvResponse().Substring(0,3)]==null)
{
errmsg="網絡連接失敗";
return false;
}

string[] SendBuffer;
string SendBufferstr;

//進行SMTP驗證
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服務器驗證失敗，請核對用戶名和密碼。"))
return false;
}
else
{
SendBufferstr="HELO " + mailserver + enter;
if(!Dialog(SendBufferstr,""))
return false;
}

//
SendBufferstr="MAIL FROM:<" + From + ">" + enter;
if(!Dialog(SendBufferstr,"發件人地址錯誤，或不能為空"))
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,"收件人地址有誤"))
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,"密件收件人地址有誤"))
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;//內容格式和分隔符
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;//內容格式和分隔符
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("郵件內容為HTML格式，請選擇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,"錯誤信件信息"))
return false;

SendBufferstr="QUIT" + enter;
if(!Dialog(SendBufferstr,"斷開連接時錯誤"))
return false;

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

#endregion

#region
/*
/// <summary>
/// 添加一個密件收件人
/// </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+="收件人過多";
return false;
}
}

/// <summary>
/// 添加一組密件收件人（不超過10個），參數為字符串數組
/// </summary>
/// <param name="str">保存有收件人地址的字符串數組（不超過10個）</param>
public bool AddRecipIEntBCC(string[] str)
{
for(int i=0;i<str.Length;i++)
{
if(!AddRecipIEntBCC(str[i]))
{
return false;
}
}
return true;
}

*/
#endregion
}

#endregion
}