public void Register(string email, string password)
{
if (!email.Contains("@"))
throw new Exception("Email is not an email!");
var user = new User(email, password);
var db = new FakeDatabase();
db.Save(user);
var smtpClient = new FakeSmtpClient();
smtpClient.Send(new MailMessage("*****@*****.**", email) { Subject = "Hello fool!" });
}