MailMessage mail = new MailMessage();
mail.From = new MailAddress("sully000000@gmail.com");
mail.To.Add(mailaddress);
mail.Subject = "Invitation to GroupBookings-Inc.com";
mail.Body = "You have been invited to a group <a href='http://localhost:1744/Register.aspx?GroupID=" + grpID + ">Invitation</a>";
SmtpClient smtp = new SmtpClient();
smtp.Host = ConfigurationManager.AppSettings["SMTP"];
smtp.EnableSsl = true;
smtp.Credentials = new System.Net.NetworkCredential(ConfigurationManager.AppSettings["FROMEMAIL"], ConfigurationManager.AppSettings["FROMPWD"]);
smtp.Send(mail);