check Email exist or not

[kavitha_blueindia]

Hi all, Is there any way to check whether Email exists not syntax wise.For eg:aaaaaaaaaaa@bbbbb.com. though it has valid syntax it doesn't exist in real.How to check this using asp.net code.Please help me. Thanks.

[Christian Graus]

No, there isn't, not short of sending an email and seeing if it bounces, but that's not 100%, and it's user intrusive.

Christian Graus Driven to the arms of OSX by Vista.

[Tamer Oz]

There is no 100% guranteed way but you can check mx records. Try the following code it may give an idea. public class MailValidator { private bool mResult = false; public bool Result { get { return mResult; } set { mResult = value; } } private string mError = ""; public string Error { get { return mError; } set { mError = value; } } private string mMailAddress = ""; public string MailAddress { get { return mMailAddress; } set { mMailAddress = value; } } public MailValidator(string mailAddress) { mMailAddress = mailAddress; } public bool MailExists() { string domainName = mMailAddress.Substring(mMailAddress.IndexOf("@") + 1); foreach (string str in Mx.GetMXRecords(domainName)) { TcpClient insTcpClient=null; try { //MessageBox.Show(str); insTcpClient = new TcpClient(str, 25); NetworkStream ns = insTcpClient.GetStream(); byte[] recievedMessage = new byte[insTcpClient.ReceiveBufferSize]; ns.Read(recievedMessage, 0, insTcpClient.ReceiveBufferSize); //MessageBox.Show(Encoding.ASCII.GetString(recievedMessage)); string messageToSend = "HELO\r\n"; byte[] buffer = System.Text.Encoding.GetEncoding(1254).GetBytes(messageToSend); ns.Write(buffer, 0, buffer.Length); recievedMessage = new byte[insTcpClient.ReceiveBufferSize]; ns.Read(recievedMessage, 0, insTcpClient.ReceiveBufferSize); //MessageBox.Show(Encoding.ASCII.GetString(recievedMessage)); messageToSend = "MAIL FROM:<deneme@" + domainName + ">\r\n"; buffer = System.Text.Encoding.GetEncoding(1254).GetBytes(messageToSend); ns.Write(buffer, 0, buffer.Length); recievedMessage = new byte[insTcpClient.ReceiveBufferSize]; ns.Read(recievedMessage, 0, insTcpClient.ReceiveBufferSize); //MessageBox.Show(Encoding.ASCII.GetString(recievedMessage)); messageToSend = "RCPT TO:<" + mMailAddress + ">\r\n"; buffer = Syst

[David Mujica]

Check this site out ... http://www.webservicex.net/WCF/ServiceDetails.aspx?SID=22[^] I played around with it and it seemed to work very well. I don't know how they validate the email address, but it seems to work. I've also played around with their stock-quote webservice, which works very nicely. Give it a shot.