# `Bamboo.DeliverLaterStrategy`
[🔗](https://github.com/thoughtbot/bamboo/blob/main/lib/bamboo/strategies/deliver_later_strategy.ex#L1)

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

# `deliver_later`

```elixir
@callback deliver_later(
  atom(),
  %Bamboo.Email{
    assigns: term(),
    attachments: term(),
    bcc: term(),
    blocked: term(),
    cc: term(),
    from: term(),
    headers: term(),
    html_body: term(),
    private: term(),
    subject: term(),
    text_body: term(),
    to: term()
  },
  map()
) :: any()
```

---

*Consult [api-reference.md](api-reference.md) for complete listing*