lib/headquarters/railtie.rb
require 'headquarters/rails_delivery_method'
module Headquarters
class Railtie < ::Rails::Railtie
initializer 'headquaters.add_delivery_method' do
ActiveSupport.on_load :action_mailer do
ActionMailer::Base.add_delivery_method :headquarters, Headquarters::RailsDeliveryMethod
end
end
end
end