如何检查Yahoo Mail Server中的电子邮件存在 [英] How To check Email Existence In Yahoo Mail Server

问题描述

我已经编写了一个代码来验证电子邮件存在它工作得很好而且非常好，

但在某些情况下对于雅虎邮件服务器它会出错

代码： -

I Have Written a code to verify email existence it work fine and very good ,
But in some cases for yahoo mail server it goes wrong
Code :-

TcpClient tClient = new TcpClient(recMx.EXCHANGE, 25);                    
string CRLF = "\r\n";
byte[] dataBuffer;
string ResponseString;
NetworkStream netStream = tClient.GetStream();
StreamReader reader = new StreamReader(netStream);
ResponseString = reader.ReadLine();
/* Perform HELO to SMTP Server and get Response */
dataBuffer = BytesFromString("HELO Here" + CRLF);
netStream.Write(dataBuffer, 0, dataBuffer.Length);
ResponseString = reader.ReadLine();
string str = strInputEmail;
dataBuffer = BytesFromString("MAIL FROM:<" + str + ">" + CRLF);
netStream.Write(dataBuffer, 0, dataBuffer.Length);
ResponseString = reader.ReadLine();
/* Read Response of the RCPT TO Message to know from google if it exist or not */
dataBuffer = BytesFromString("RCPT TO:<" + strInputEmail.Trim() + ">" + CRLF);
//dataBuffer = BytesFromString("RCPT TO:<" + "[e-mail]" + ">" + CRLF);
netStream.Write(dataBuffer, 0, dataBuffer.Length);
ResponseString = reader.ReadLine();
dataBuffer = BytesFromString("QUITE" + CRLF);
netStream.Write(dataBuffer, 0, dataBuffer.Length);
tClient.Close();
if (GetResponseCode(ResponseString) == 550)
{
   

    return ("NotVerified");
    //Response.Write("<font color="red">Original Error from Smtp Server :</font>" + ResponseString);
}
else if (GetResponseCode(ResponseString) == 250)
{
  
    return ("Verified");
}
else
{

    return (ResponseString);

}

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