UserConfirmationController.create.ex

def create(conn, %{"user" => %{"email" => email}}) do
  if user = Accounts.get_user_by_email(email) do
    Accounts.deliver_user_confirmation_instructions(
      user,
      &Routes.user_confirmation_url(conn, :confirm, &1)
    )
  end

  # Regardless of the outcome, show an impartial success/error message.
  conn
  |> put_flash(
    :info,
    "If your email is in our system and it has not been confirmed yet, " <>
      "you will receive an email with instructions shortly."
  )
  |> redirect(to: "/")
end