class Program
    {
        static void Send(string sender, string recipient, string subject, string plainTextBody)
        {
            using (var cl = new SmtpClient("smtp.gmail.com", 587) { Credentials = new NetworkCredential("kav.public@gmail.com", "***"), EnableSsl = true })
            {
                var mailMessage = new MailMessage(sender, recipient, subject, plainTextBody)
                    {
                        BodyEncoding = Encoding.UTF8,
                        BodyTransferEncoding = TransferEncoding.Base64,
                        SubjectEncoding = Encoding.UTF8
                    };

                cl.Send(mailMessage);
            }
            Console.WriteLine("Sended");
        }

        static void Main(string[] args)
        {
            for (int i = 0; i < 20; i++)
            {
                Send("kav.public@gmail.com", "***", "test",
                     "bvhjbfdvhbfdabvbv hjbvbdhjvbhfdbvhjbhjfbv bhvb hdbvbhfbvhjbdfvb hjb vhjfbvhjbf hvbhfbvh jbfhjvbfb vhjfbvhjbfbvhjfdbv78re7rbuy");
            }

            Console.WriteLine("Finish");
            Console.ReadLine();
        }
    }

        static void Main(string[] args)
        {
            using (var cl = new SmtpClient("smtp.gmail.com", 587) { Credentials = new NetworkCredential("kav.public@gmail.com", "***"), EnableSsl = true })
            {

                for (int i = 0; i < 50; i++)
                {

                    var mailMessage = new MailMessage("kav.public@gmail.com", "***", "test",
                                                      "bvhjbfdvhbfdabvbv hjbvbdhjvbhfdbvhjbhjfbv bhvb hdbvbhfbvhjbdfvb hjb vhjfbvhjbf hvbhfbvh jbfhjvbfb vhjfbvhjbfbvhjfdbv78re7rbuy")
                        {
                            BodyEncoding = Encoding.UTF8,
                            BodyTransferEncoding = TransferEncoding.Base64,
                            SubjectEncoding = Encoding.UTF8
                        };

                    cl.Send(mailMessage);
                    Console.WriteLine("Sended");

                }

            }

            Console.WriteLine("Finish");
            Console.ReadLine();
        }