Include AbsC::Rendering interface in ActionMailer

actionmailer/lib/action_mailer/base.rb

@@ -4,6 +4,7 @@
 require 'active_support/core_ext/string/inflections'
 require 'active_support/core_ext/hash/except'
 require 'active_support/core_ext/module/anonymous'
+
 require 'action_mailer/log_subscriber'
 
 module ActionMailer
@@ -365,6 +366,8 @@ class Base < AbstractController::Base
 
     abstract!
 
+    include AbstractController::Rendering
+
     include ActionView::Layouts
 
     include AbstractController::Logger