比如pop.yeah.net这是现在的代码。
            TcpClient tcpClient = new TcpClient(this.HostName,this.Port);
            NetworkStream ns = tcpClient.GetStream();
            StreamReader rs = new StreamReader(ns);            rs.ReadLine();            string data;
            if (context == null)
            {
                data = command + "\r\n";
            }
            else
            {
                data = command + " " + context + "\r\n";
            }            byte[] bytesData = Encoding.ASCII.GetBytes(data);            try
            {
                ns.Write(bytesData, 0, bytesData.Length);
                Debug.WriteLine(rs.ReadLine());
            }
            catch (Exception ex)
            {
                Debug.WriteLine(ex.Message);
            }