Behaviour for delivering emails with Bamboo.Mailer.deliver_later/1.

Use this behaviour to create strategies for background email delivery. You could make a strategy using a GenServer, a background job library or whatever else you decide.

Bamboo ships with two strategies:

• Bamboo.TaskSupervisorStrategy
• Bamboo.ImmediateDeliveryStrategy

Example of setting custom strategies

config :my_app, MyApp.Mailer,
  adapter: Bamboo.MandrillAdapter, # or whatever adapter you want
  deliver_later_strategy: MyCustomStrategy

Example of creating a custom strategy for delivering later using Task.async

defmodule Bamboo.TaskAsyncStrategy do
  @behaviour Bamboo.DeliverLaterStrategy

  # This is a strategy for delivering later using Task.async
  def deliver_later(adapter, email, config) do
    Task.async fn ->
      # Always call deliver on the adapter so that the email is delivered.
      adapter.deliver(email, config)
    end
  end
end