public bool CheckMailboxExists(string email, out SmtpStatusCode result)
{
try
{
using (TcpClient tcpClient = new TcpClient())
{
tcpClient.SendTimeout = 1000;
tcpClient.ReceiveTimeout = 1000;
if (!tcpClient.ConnectAsync(_host, _port).Wait(1000))
{
throw new SmtpClientTimeoutException();
}
NetworkStream networkStream = tcpClient.GetStream();
StreamReader streamReader = new StreamReader(networkStream);
this.AcceptResponse(streamReader, SmtpStatusCode.ServiceReady);
string mailHost = (new MailAddress(email)).Host;
this.SendCommand(networkStream, streamReader, "HELO " + mailHost, SmtpStatusCode.Ok);
this.SendCommand(networkStream, streamReader, "MAIL FROM:<check@" + mailHost + ">", SmtpStatusCode.Ok);
_response = this.SendCommand(networkStream, streamReader, "RCPT TO:<" + email + ">");
this.SendCommand(networkStream, streamReader, "QUIT", SmtpStatusCode.ServiceClosingTransmissionChannel, SmtpStatusCode.MailboxUnavailable);
result = _response.Code;
return(true);
}
}
catch (IOException e)
{
// StreamReader problem
}
catch (SocketException e)
{
// TcpClient problem
}
result = SmtpStatusCode.GeneralFailure;
return(false);
}
public SmtpService(string host, int port = 25)
{
_host = host;
_port = port;
_response = new SmtpResponse();
}