SmtpClient ss = new SmtpClient();
ss.Host = "relay-hosting.secureserver.net";
ss.Port = 25;
ss.Timeout = 10000;
ss.DeliveryMethod = SmtpDeliveryMethod.Network;
ss.UseDefaultCredentials = false;
ss.Credentials = new NetworkCredential("your_full_emailAddress", "YourPassword", "your_Domain");
ss.EnableSsl = false;
MailMessage mailMsg = new MailMessage("your_full_emailAddress", "demo@gmail.com", "subject here", "my body");
mailMsg.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;
ss.Send(mailMsg);
Response.Write("Mail Sent");