public void SendMessage()
        {
            try
            {
                MailAddress fromMailAddress = new MailAddress("sup@kai.ua");
                MailAddress toAddress = new MailAddress("sup@kai.ua");

                using (MailMessage mailMessage = new MailMessage(fromMailAddress, toAddress))
                using (SmtpClient smtpClient = new SmtpClient())
                {
                    mailMessage.Subject = "Test Email";
                    mailMessage.Body = "Helllllooo!!!";

                    smtpClient.Host = "mail.adm.tools";
                    smtpClient.Port = 465;
                    smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
                    smtpClient.EnableSsl = true;
                    smtpClient.UseDefaultCredentials = false;
                    smtpClient.Credentials = new NetworkCredential(fromMailAddress.Address, "parol");

                    smtpClient.Send(mailMessage);
                    MessageBox.Show("Email sent successfully!");
                }

            }
            catch (SmtpException ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
    }