    # File lib/action_mailer/vendor/tmail-1.2.3/tmail/quoting.rb, line 36
        def body(to_charset = 'utf-8', &block)
          attachment_presenter = block || Proc.new { |file_name| "Attachment: #{file_name}\n" }

          if multipart?
            parts.collect { |part|
              header = part["content-type"]

              if part.multipart?
                part.body(to_charset, &attachment_presenter)
              elsif header.nil?
                ""
              elsif !attachment?(part)
                part.unquoted_body(to_charset)
              else
                attachment_presenter.call(header["name"] || "(unnamed)")
              end
            }.join
          else
            unquoted_body(to_charset)
          end
        end