# File lib/mail/utilities.rb, line 19
    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