application_mailer_file_name

# File actionmailer/lib/rails/generators/mailer/mailer_generator.rb, line 29
        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