asp.net c# code to send mail eithout using IP address

var mail = new MailMessage();
                        mail.From = new MailAddress("Email adress");
                        mail.To.Add("to Email");

                        mail.Subject = "Event Information";
                        mail.IsBodyHtml = true;
                        mail.Body = "body";
                        var mailClient = new SmtpClient("smtp.gmail.com", 587);
                        mailClient.EnableSsl = true;
                        mailClient.Credentials = new System.Net.NetworkCredential("Email", "password");
                        mailClient.Send(mail);