--- Mail.new(f)
      ᡼Ϥ롣
      f ϥե̾ IO ֥ȡ
      Υ᥽åɤ¹Ԥǥإåʸڤʬ졢إå
      ϥå(إåեñ)ʸ(ñ)롣

      1եʣ᡼η(Unix From )бƤ
      (ξ open Ѥߤ IO Ϥɬפ뤳Ȥ)
      㤨аʲΤ褦ˤƳƥ᡼ Subject ɽǤ

        require 'mailread'
        require 'nkf'

        mailbox = File.open('/var/mail/arai')
        until (m = Mail.new(mailbox)).header.empty?
          puts NKF.nkf('-me', m['subject'])
        end

