Code:static void Main(string[] args) { Console.WriteLine("Mail To"); MailAddress to = new MailAddress(Console.ReadLine()); Console.WriteLine("Mail From"); MailAddress from = new MailAddress(Console.ReadLine()); MailMessage mail = new MailMessage(from, to); Console.WriteLine("Subject"); mail.Subject = Console.ReadLine(); Console.WriteLine("Your Message"); mail.Body = Console.ReadLine(); SmtpClient smtp = new SmtpClient(); smtp.Host = "smtp.gmail.com"; smtp.Port = 587; smtp.Credentials = new NetworkCredential( "[email protected]", "password"); smtp.EnableSsl = true; Console.WriteLine("Sending email..."); smtp.Send(mail); //The SMTP server requires a secure connection or the client was not authenticated }