邮件发送怎么样检测邮箱是否真实存在

天上下雨 2009-07-25 11:41:29

jmail.MessageClass jm = new jmail.MessageClass();
///设置邮件编码方式
jm.Charset = "gb2312";
///是否将信头编码成ISO-8859-1字符集
jm.ISOEncodeHeaders = false;
///邮件发送人的邮箱地址
jm.From = 发件人邮箱;
///邮件发送人
jm.FromName = 发件人;
///邮件的主题
jm.Subject = 邮件主题;
///身份验证的用户名
jm.MailServerUserName = 邮箱名;
///身份验证密码
jm.MailServerPassWord = 邮箱密码;
///收件人地址，如果要添加多个收件人，则重复下面的语句
jm.AddRecipient(收件人, "", "");
///邮件内容
jm.Body = txtcontent.Text.ToString().Trim().Replace("'", "");
///邮件服务器
///发送邮件
jm.Send(邮件服务器, false);
当收件人邮箱不存在的时候会报错，报错为：
The message was undeliverable. All servers failed to receive the message？

...全文

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qingniaoIT 2009-07-27

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看了楼上的所有方法，应该都是不行的吧，个人认为目前还没有一种很好的办法来快速检测邮箱地址是否存在, 虽然帖主已经结贴了，但还是大家来讨论这个问题。

天上下雨 2009-07-25

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谢谢了

yuanmanguo 2009-07-25

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以前的一段代码



using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;



using System.Net.Mail;

using System.Management;





using System.Diagnostics;

using System.IO;

using System.Text.RegularExpressions;

using System.Net;

using System.Net.Sockets;



namespace CheckMailbox

{

    public partial class Form1 : Form

    {

        TcpClient tcpc;

        NetworkStream s;

        string strDomain;

        byte[] bb;

        int len;

        string read;

        string stringTosend;

        byte[] arrayToSend;

        bool flag;

        int count=0;



        public Form1()

        {

            InitializeComponent();

        }



        public string getMailServer(string strEmail,bool IsCheck)

        {

         strDomain=strEmail.Split('@')[1];

         if(IsCheck==true)

             this.textBoxShow.Text += "分离出邮箱域名：" + strDomain + "\r\n";

         ProcessStartInfo info=new ProcessStartInfo();   //指定启动进程时使用的一组值。

            info.UseShellExecute=false;

         info.RedirectStandardInput=true;

         info.RedirectStandardOutput=true;

         info.FileName="nslookup";

         info.CreateNoWindow=true;

         info.Arguments="-type=mx "+strDomain;

         Process ns=Process.Start(info);        //提供对本地和远程进程的访问并使您能够启动和停止本地系统进程。

         StreamReader sout=ns.StandardOutput;



         Regex reg = new Regex(@"mail exchanger = (?<mailServer>[^\s]+)");

         string strResponse="";

         while((strResponse=sout.ReadLine())!=null){

         

             Match amatch=reg.Match(strResponse);   // Match  表示单个正则表达式匹配的结果。



             if (reg.Match(strResponse).Success)

             {

                 return amatch.Groups["mailServer"].Value;   //获取由正则表达式匹配的组的集合

                 

             }

         }

         return null;

        }



        private void Connect(string mailServer)

        {

            try

            {

                tcpc.Connect(mailServer, 25);

                s = tcpc.GetStream();

                len = s.Read(bb, 0, bb.Length);

                read = Encoding.UTF8.GetString(bb);

                if (read.StartsWith("220") == true)

                    this.textBoxShow.Text += "连接服务器成功！" + "\r\n";

            }

            catch(Exception e)

            {

                MessageBox.Show(e.ToString());

 

            }

        }



        private bool SendCommand(string command)

        {

            try

            {



                arrayToSend = Encoding.UTF8.GetBytes(command.ToCharArray());

                s.Write(arrayToSend, 0, arrayToSend.Length);

                len = s.Read(bb, 0, bb.Length);

                read = Encoding.UTF8.GetString(bb);

                this.textBoxShow.Text += "收到："+read.Substring(0, len) + "\r\n";

                

                       

                

            }

            catch (IOException e)

            {

                MessageBox.Show(e.ToString());

            }

            if(read.StartsWith("250"))

                 return true;

            else

                 return false;

        }



        public void checkEmail(string mailAddress)

        {

            

           

            

           Regex reg = new Regex(@"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*");



          if (!reg.IsMatch(mailAddress)) {

              timer1.Enabled = false;

              this.textBoxShow.Text += "Email地址形式上就不对" + "\r\n";

              this.labelResult.Text = "邮箱不存在！";

              return;

          }//Email地址形式上就不对

          



          string mailServer=getMailServer(mailAddress,true);

          

          if(mailServer==null)

          {

              timer1.Enabled = false;

              this.textBoxShow.Text += "邮件服务器不存在！" + "\r\n";

              this.labelResult.Text = "邮箱不存在！";

              return;

            //邮件服务器探测错误

          }

          this.textBoxShow.Text += "解析出域名" + strDomain + "的mx记录：" + mailServer + "\r\n";

          tcpc=new TcpClient();      //为 TCP 网络服务提供客户端连接。

          tcpc.NoDelay=true;

          tcpc.ReceiveTimeout=3000;

          tcpc.SendTimeout=3000;

          bb = new byte[512];



          try

          {



              string strResponse = "";

              string strTestFrom = "755191381@qq.com";



              this.textBoxShow.Text += "连接服务器：" +mailServer+ "\r\n";

              Connect(mailServer);



              string mailServer2 = getMailServer(strTestFrom,false);





              stringTosend = "helo " + mailServer2 + "\r\n";

              this.textBoxShow.Text += "发送：" + stringTosend;

              flag= SendCommand(stringTosend);



              if (flag == false)

              {

                  timer1.Enabled = false;

                  return;

              }



              stringTosend = "mail from:<" + strTestFrom + ">" + "\r\n";

              this.textBoxShow.Text += "发送：" + stringTosend;

              flag= SendCommand(stringTosend);



              if (flag == false)

              {

                  timer1.Enabled = false;                 

                  return;

              }

          

            

              stringTosend = "rcpt to:<" + mailAddress + ">" + "\r\n";

              this.textBoxShow.Text += "发送：" + stringTosend;

              flag= SendCommand(stringTosend);



              if (flag == true)

              {

                  timer1.Enabled = false;

                  this.labelResult.Text = "";

                  this.labelResult.Text = "邮箱存在！";

              }

              else

              {

                  timer1.Enabled = false;

                  this.textBoxShow.Text += "用户不存在！" + "\r\n";

                  this.labelResult.Text = "邮箱不存在！";

              }

              /*

              stringTosend = "data" + "\r\n";

              this.textBoxShow.Text += "发送：" + stringTosend;

              flag = SendCommand(stringTosend);

              stringTosend = "Subject:wuzhi"+"\r\n"+"\r\n"+"hehe,zhiwu,wanshanghao!" + "\r\n"+"."+"\r\n";

              flag = SendCommand(stringTosend);

              */





            

            

         

          }

          catch (Exception ee)

          {

              MessageBox.Show( ee.ToString());   //发生错误或邮件服务器不可达

                     

          }

        }





       

        private void buttonCheck_Click(object sender, EventArgs e)

        {

            string strMailbox;

            

            strMailbox = this.textBoxMailbox.Text.ToString();

            timer1.Enabled = true;

            this.labelResult.Text = "";

            this.textBoxShow.Text = "";

            this.textBoxShow.Text = "开始检测邮箱地址：" + strMailbox+"\r\n";



            checkEmail(textBoxMailbox.Text.ToString());

 

           

            

        }



        private void timer1_Tick(object sender, EventArgs e)

        {

            if (count == 3) count = 0;

            this.labelResult.Text = "";

            string proc="。";

            for (int i = 0; i<=count; i++)

            {

                proc += "。";

            }

            this.labelResult.Text = "";

            this.labelResult.Text = "检测中"+proc;

            count++;

        }

    }

}