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diff --git a/actionmailer/lib/action_mailer.rb b/actionmailer/lib/action_mailer.rb
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+++ b/actionmailer/lib/action_mailer.rb
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+# frozen_string_literal: true
+
+#--
+# Copyright (c) 2004-2019 David Heinemeier Hansson
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#++
+
+require "abstract_controller"
+require "action_mailer/version"
+
+# Common Active Support usage in Action Mailer
+require "active_support"
+require "active_support/rails"
+require "active_support/core_ext/class"
+require "active_support/core_ext/module/attr_internal"
+require "active_support/core_ext/string/inflections"
+require "active_support/lazy_load_hooks"
+
+module ActionMailer
+  extend ::ActiveSupport::Autoload
+
+  eager_autoload do
+    autoload :Collector
+  end
+
+  autoload :Base
+  autoload :DeliveryMethods
+  autoload :InlinePreviewInterceptor
+  autoload :MailHelper
+  autoload :Parameterized
+  autoload :Preview
+  autoload :Previews, "action_mailer/preview"
+  autoload :TestCase
+  autoload :TestHelper
+  autoload :MessageDelivery
+  autoload :DeliveryJob
+  autoload :MailDeliveryJob
+
+  def self.eager_load!
+    super
+
+    require "mail"
+    Mail.eager_autoload!
+  end
+end
+
+autoload :Mime, "action_dispatch/http/mime_type"
+
+ActiveSupport.on_load(:action_view) do
+  ActionView::Base.default_formats ||= Mime::SET.symbols
+  ActionView::Template::Types.delegate_to Mime
+end