string[] host = (address.Split('@')); string hostname = host[1];
        try
        {
            IPHostEntry IPhst = Dns.GetHostEntry(hostname);

            IPEndPoint endPt = new IPEndPoint(IPhst.AddressList[0], 25);
            Socket s = new Socket(endPt.AddressFamily, SocketType.Stream, ProtocolType.Tcp);

            s.Connect(endPt);