# File lib/rmail/mailbox.rb, line 22
      def parse_mbox(input, line_separator = $/)
        require 'rmail/mailbox/mboxreader'
        retval = []
        RMail::Mailbox::MBoxReader.new(input, line_separator).each_message {
          |reader|
          raw_message = reader.read(nil)
          if block_given?
            yield raw_message
          else
            retval << raw_message
          end
        }
        return block_given? ? nil : retval
      end