    # File lib/vmail/message_formatter.rb, line 98
        def format_html_body(part)
          html_tool = ENV['VMAIL_HTML_PART_READER'] || 'lynx -stdin -dump'
          html = part.body.decoded.gsub("\r", '')
          stdin, stdout, stderr = Open3.popen3(html_tool)
          stdin.puts html
          stdin.close
          output = "[vmail: html part translated into plaintext by '#{html_tool}']\n\n" + stdout.read
          charset = part.content_type_parameters && part.content_type_parameters['charset']
          if charset && charset != 'UTF-8'
            Iconv.conv('UTF-8//TRANSLIT//IGNORE', charset, output)
          else
            output
          end
        end