# File lib/mail/utilities.rb, line 48
    def dquote( str )
      match = str.match(/^"(.*)?"$/)
      str = match[1] if match
      # First remove all escaped double quotes:
      str = str.gsub(/\\"/, '"')
      # Then wrap and re-escape all double quotes
      '"' + str.gsub(/["]/n) {|s| '\\' + s } + '"'
    end