using System;

public class Program

{

​

        public static void Main()

    {

                Console.WriteLine(CheckEmail("christopher@.teljstedt@gmail-..com"));

    }

            public static bool CheckEmail(string email)

        {

​

            try

            {

                var addr = new System.Net.Mail.MailAddress(email);

                return addr.Address == email;

            }

            catch

            {

                return false;

            }

        }

​

}