--- URI::MailTo#to_mailtext
--- URI::MailTo#to_rfc822text

    URI ֥Ȥ᡼ƥʸޤ

      require 'uri'
      p mailto = URI.parse("mailto:ruby-list@ruby-lang.org?subject=subscribe&cc=myaddr")
      print mailto.to_mailtext

      => #<URI::MailTo:0x20104a0e URL:mailto:ruby-list@ruby-lang.org?subject=subscribe&cc=myaddr>
         To: ruby-list@ruby-lang.org
         Subject: subscribe
         Cc: myaddr

