send email throw any netword to any other nerwork

Using System.net.mail;             
 MailMessage mail = new MailMessage();
                SmtpClient SmtpServer = new SmtpClient("smtp.leadforce.in");
                SmtpServer.Host = "50.97.99.170";
                mail.From = new MailAddress("rajaservice88@gmail.com");
                mail.To.Add(TextBox1.Text);
                mail.Subject = TextBox2.Text;
                mail.Body = TextBox3.Text;
                mail.Priority = MailPriority.High;
                SmtpServer.Port = 25;
                SmtpServer.Credentials = new          System.Net.NetworkCredential("vertex@leadforce.in", "password");
                SmtpServer.EnableSsl = true;
                SmtpServer.Send(mail);
                Label1.Text = "send msg";