application_mailer_file_name

# File actionmailer/lib/rails/generators/mailer/mailer_generator.rb, line 28
        def application_mailer_file_name
          @_application_mailer_file_name ||= if mountable_engine?
                                             "app/mailers/#{namespaced_path}/application_mailer.rb"
                                           else
                                             "app/mailers/application_mailer.rb"
                                           end
        end