philomena/lib/philomena_web/pow_mailer.ex

defmodule PhilomenaWeb.PowMailer do
  use Pow.Phoenix.Mailer
  alias PhilomenaWeb.Mailer
  alias Philomena.Users.User
  import Bamboo.Email

  def cast(%{
        user: %User{email: email},
        subject: subject,
        text: text,
        html: html,
        assigns: _assigns
      }) do
    # Build email struct to be used in `process/1`
    new_email(
      to: email,
      from: Application.get_env(:philomena, :mailer_address),
      subject: subject,
      text_body: text,
      html_body: html
    )
  end

  def process(email) do
    email
    |> Mailer.deliver_later()
  end
end