Code:

            
            using System.Net.Mail;



            try
            {
                MailMessage mail = new MailMessage();
                SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");
                mail.From = new MailAddress("mail sa koga saljes poruku");
                mail.To.Add("mail kome saljes");
                mail.Subject = "naslovmail-a";
                mail.Body = "tekstmail-a";
                SmtpServer.Port = 587;
                SmtpServer.Credentials = new System.Net.NetworkCredential("tvojekorisnickoime", "tvojasifra");
                SmtpServer.EnableSsl = true;
                SmtpServer.Send(mail);
                
            }
            catch (Exception ex)
            {
                
                MessageBox.Show(ex.ToString());

            }