技术文章 > c#发送需要smtp认证的邮件

c#发送需要smtp认证的邮件

2018-11-14 14:22

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-------------------------调用类 -----------------------------------
private void SendMaill(string username,string superpassword,string email) {
string body=“尊敬的用户:<br><br>您好!<br><br>  你的登录用户名是:“+username+“这是你的超级密码:“+superpassword
+“为了您的账号安全,我们建议您在收到邮件的72小时之内,到官方网站进行修改,并把该邮件删除。“
+“<br><br>“
+“ 如有任何疑问,欢迎致电×××××发展有限责任公司客服热线:028-×××××××,我们将热情为您解答。“
+“ 感谢您的支持!<br><br>“
+“                                          ××××××发展有限责任公司<br><br>“
+“                                          “+System.DateTime.Now.Year+“年“+System.DateTime.Now.Month+“月“+System.DateTime.Now.Day+“日<br><br>“
+“                                          官网:http://www.×××××.com<br><br>“
+“                                          ××××:http://www.××××.com“;
lion_office.Data.Library.MailClass.ESmtpMail sm=new lion_office.Data.Library.MailClass.ESmtpMail();
sm.Send(“mail.××××.com“,
“×××@××××.com“,
“××客服“,
email,
username,
true,
“×××官方网站密码找回邮件“,
body
);
Session.Remove(“dd“);
Response.Redirect(“FindSPassOK.aspx“);
}

-------------------------基类---------------------
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:paswww.server.com:25“,也可省略次要信息。如“user:paswww.server.com“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
{
return errmsg;
}
}

/// <summary>
/// 服务器交互记录
/// </summary>
private string logs=““;
/// <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>
/// 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=“estr“>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=“dstr“>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>
/// 添加邮件附件
/// </summary>
/// <param name=“path“>附件绝对路径</param>
public void AddAttachment(string path)
{
Attachments.Add(path);
}

/// <summary>
/// 添加一个收件人
/// </summary>
/// <param name=“str“>收件人地址</param>
public bool AddRecipient(string str)
{
str=str.Trim();
if(str==null||str==““||str.IndexOf(“@“)==-1)
return true;
if(RecipientNum<recipientmaxnum)
{
Recipient.Add(RecipientNum,str);
RecipientNum++;
return true;
}
else
{
errmsg+=“收件人过多“;
return false;
}
}

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

/// <summary>
/// 添加一组收件人(不超过recipientmaxnum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recipientmaxnum个)</param>
public bool AddRecipient(string[] str)
{
for(int i=0;i<str.Length;i++)
{
if(!AddRecipient(str[i]))
{
return false;
}
}
return true;
}
/// <summary>
/// 发送SMTP命令
/// </summary>
private bool SendCommand(string str)
{
byte[] WriteBuffer;
if(str==null||str.Trim()==““)
{
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 = ““;
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;
return Returnvalue;
}
}

/// <summary>
/// 与服务器交互,发送一条命令并接收回应。
/// </summary>
/// <param name=“Command“>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;
}

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;
SendBufferstr=“DATA“ + enter;
if(!Dialog(SendBufferstr,““))
return false;
SendBufferstr=“From:“ + FromName + “<“ + From +“>“ +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;

if(Charset==““)
{
SendBufferstr+=“Subject:“ + Subject + enter;
}
else
{
SendBufferstr+=“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: Huolx.Pubclass“ + enter;
SendBufferstr+=“MIME-Version: 1.0“ + enter;
SendBufferstr += “Content-Type: multipart/mixed;“+enter;//内容格式和分隔符
SendBufferstr += “ boundary=\“----=_NextPart_000_00D6_01C29593.AAB31770\““+enter;
SendBufferstr += “------=_NextPart_000_00D6_01C29593.AAB31770“+enter;
if(Html)
{
SendBufferstr+=“Content-Type: text/html;“ + enter;
}
else
{
SendBufferstr+=“Content-Type: text/plain;“ + enter;
}
if(Charset==““)
{
SendBufferstr+=“ charset=\“iso-8859-1\““ + enter;
}
else
{
SendBufferstr+=“ charset=\““ + Charset.ToLower() + “\““ + enter;
}
//SendBufferstr += “Content-Transfer-Encoding: base64“+enter;
SendBufferstr+=“Content-Transfer-Encoding: base64“ + enter + enter;
SendBufferstr+= Base64Encode(Body) + enter;
if(Attachments.Count!=0)
{
foreach(string filepath in Attachments)
{
SendBufferstr += “------=_NextPart_000_00D6_01C29593.AAB31770“+enter;
SendBufferstr += “Content-Type: application/octet-stream“+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 += “------=_NextPart_000_00D6_01C29593.AAB31770--“+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;
}

/// <summary>
/// 发送邮件方法,所有参数均通过属性设置。
/// </summary>
public bool Send()
{
if(Recipient.Count==0)
{
errmsg=“收件人列表不能为空“;
return false;
}
if(mailserver.Trim()==““)
{
errmsg=“必须指定SMTP服务器“;
return false;
}
return SendEmail();
}

/// <summary>
/// 发送邮件方法
/// </summary>
/// <param name=“smtpserver“>smtp服务器信息,如“username:passwordwww.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:passwordwww.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();
}

}
}