Used for testing email delivery

No emails are sent, instead a message is sent to the current process and can be asserted on with helpers from Bamboo.Test.

Example config

# Typically done in config/test.exs
config :my_app, MyApp.Mailer,
  adapter: Bamboo.TestAdapter

# Define a Mailer. Typically in lib/my_app/mailer.ex
defmodule MyApp.Mailer do
  use Bamboo.Mailer, otp_app: :my_app
end