# File lib/mail/utilities.rb, line 26
      def quote_phrase( str )
        if RUBY_VERSION >= '1.9'
          original_encoding = str.encoding
          str.force_encoding('ASCII-8BIT')
          if (PHRASE_UNSAFE === str)
            dquote(str).force_encoding(original_encoding)
          else
            str.force_encoding(original_encoding)
          end
        else
          (PHRASE_UNSAFE === str) ? dquote(str) : str
        end
      end