static void Main(string[] args)
    {

        string server = "smtp.gmail.com";       //-- > or exchange server "mxserver@mydomain.com"
        int port = 25;                          // --> tried 25, 443, 587 110...ect
        string mailbox = "user@gmail.com";
        string password = "mypassword";
        string recipient = "user@gmail.com";


        try
        {
            Console.WriteLine("Step 1: Attempting to Connect to server: {0} over port: {1}", server, port);
            using (var client = new TcpClient(server, port))
            {
                using (var stream = client.GetStream())
                using (var clearTextReader = new StreamReader(stream))
                using (var clearTextWriter = new StreamWriter(stream) { AutoFlush = true })
                using (var sslStream = new SslStream(stream))
                {
                    var helloResponse = clearTextReader.ReadLine();
                }

            }


        }
        catch (Exception ex)
        {

            Console.WriteLine(ex.Message);
            Console.WriteLine("The Process has ended... Press any key to exit.");
            Console.ReadLine();
            return;
        }
        Console.WriteLine("Result: Success! Connected to server:{0}.", server);

        try
        {
            Console.WriteLine("Step 2: Attempting Send Mail...", server);
            using (SmtpClient smtpClient = new SmtpClient(server, port))
            {
                NetworkCredential creds = new NetworkCredential(mailbox, password);
                smtpClient.EnableSsl = true;
                ServicePointManager.ServerCertificateValidationCallback = delegate(object s, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors) { return true; };
                smtpClient.Credentials = creds;
                MailMessage msg = new MailMessage(mailbox, recipient, "Test", "This is a test");
                smtpClient.Send(msg);
                Console.WriteLine("Result: Success! Mail sent...");

            }
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }
        Console.WriteLine("The Process has ended... Press any key to exit.");
        Console.ReadLine();
    }