# File lib/rfilter/deliver.rb, line 98
    def write_to_mbox(output_io, message)
      first = true
      message.each { |line|
        if first
          first = false
          if line !~ /^From .*\d$/
            from = "From foo@bar  " + Time.now.asctime + "\n"
            output_io << from
          end
        elsif line =~ /^From /
          output_io << '>'
        end
        output_io << line
        output_io << "\n" unless line[-1] == ?\n
      }
      output_io << "\n"
    end