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configuring_mailer.md

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Configuring mailer

You are able to configure a mailer for Pow and set it up with the library of your choice.

This guide shows how to setup Pow with

You must first setup and configure either of these libraries before you can integrate them with Pow.

Swoosh mailer

Set up your WEB_PATH/mails/pow_mailer.ex file like so:

defmodule MyAppWeb.Pow.Mailer do
  use Pow.Phoenix.Mailer
  use Swoosh.Mailer, otp_app: :my_app

  import Swoosh.Email
  
  require Logger

  @impl true
  def cast(%{user: user, subject: subject, text: text, html: html}) do
    %Swoosh.Email{}
    |> to({"", user.email})
    |> from({"My App", "myapp@example.com"})
    |> subject(subject)
    |> html_body(html)
    |> text_body(text)
  end

  @impl true
  def process(email) do
    # An asynchronous process should be used here to prevent enumeration
    # attacks. Synchronous e-mail delivery can reveal whether a user already
    # exists in the system or not.

    Task.start(fn ->
      email
      |> deliver()
      |> log_warnings()
    end)

    :ok
  end

  defp log_warnings({:error, reason}) do
    Logger.warning("Mailer backend failed with: #{inspect(reason)}")
  end

  defp log_warnings({:ok, response}), do: {:ok, response}
end

Remember to add mailer_backend: MyAppWeb.Pow.Mailer to the Pow configuration, and set the Swoosh configuration:

# config/config.exs
config :my_app, :pow,
  user: MyApp.Users.User,
  repo: MyApp.Repo,
  mailer_backend: MyAppWeb.Pow.Mailer

# config/prod.exs
config :my_app, MyAppWeb.Pow.Mailer,
  adapter: Swoosh.Adapters.Sendgrid,
  api_key: "SG.x.x"

Bamboo mailer

Set up your WEB_PATH/mails/pow_mailer.ex file like so:

defmodule MyAppWeb.Pow.Mailer do
  use Pow.Phoenix.Mailer
  use Bamboo.Mailer, otp_app: :my_app

  import Bamboo.Email

  @impl true
  def cast(%{user: user, subject: subject, text: text, html: html}) do
    new_email(
      to: user.email,
      from: "myapp@example.com",
      subject: subject,
      html_body: html,
      text_body: text
    )
  end

  @impl true
  def process(email) do
    # An asynchronous process should be used here to prevent enumeration
    # attacks. Synchronous e-mail delivery can reveal whether a user already
    # exists in the system or not.

    deliver_later(email)
  end
end

Remember to add mailer_backend: MyAppWeb.Pow.Mailer to the Pow configuration, and set the Bamboo configuration:

# config/config.exs
config :my_app, :pow,
  user: MyApp.Users.User,
  repo: MyApp.Repo,
  mailer_backend: MyAppWeb.Pow.Mailer

# config/prod.exs
config :my_app, MyAppWeb.Pow.Mailer,
  adapter: Bamboo.MandrillAdapter, # Specify your preferred adapter
  api_key: "my_api_key" # Specify adapter-specific configuration