Check if email address really exsist or not using c#

Question

hi guys how r u all ?

my question is that, i have read the article about check if email address really exsist or not using c# that is very fruit full but that is only for gmail how can i find this on yahoo or hotmail as well ?

reply soon

Thanks.

Vicky Malhotra · Answer

what is this yar... only for gmail nothing for others. you have only gmail solution that i have already .now i want solution for all domain not for only gmail. if you ... then please yar give solution for all guys.otherwise say i dont know about that. thnkx....

sathees kumar · Answer

you were given only for gmail Id's...but what about the others?

Sujit Bhujbal · Answer

we used basic technique of SMTP commands to check if mail address exist or not. Please see following code for that using System.Net.Sockets; using System.IO; using System.Text;public partial class _Default : System.Web.UI.Page { protected void btnCheck_Click(object sender, EventArgs e) { TcpClient tClient = new TcpClient("gmail-smtp-in.l.google.com", 25); string CRLF = "
"; 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 KirtanHere" + CRLF); netStream.Write(dataBuffer, 0, dataBuffer.Length); ResponseString = reader.ReadLine(); dataBuffer = BytesFromString("MAIL FROM: YourGmailIDHere@gmail.com >" + 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: "+CRLF); netStream.Write(dataBuffer, 0, dataBuffer.Length); ResponseString = reader.ReadLine(); if (GetResponseCode(ResponseString) == 550) { Response.Write("Mai Address Does not Exist ! "); Response.Write(" Original Error from Smtp Server : "+ResponseString); } /* QUITE CONNECTION */ dataBuffer = BytesFromString("QUITE" + CRLF); netStream.Write(dataBuffer, 0, dataBuffer.Length); tClient.Close(); } private byte[] BytesFromString(string str) { return Encoding.ASCII.GetBytes(str); } private int GetResponseCode(string ResponseString) { return int.Parse(ResponseString.Substring(0, 3)); } Regards Sujeet Bhujbal http://sujitbhujbal.blogpspot.com