On 13 Feb, 2005, at 22:43, Glenn English wrote:
then switch it back when the US office mail server is back up.
Define "rapidly". You could set up a cron job to check the local server
every 60 seconds -- and if it isn't up, rsync the relevant email files
to the remote server, change the MX record(s) with sed, and reload the
DNS server. And vice versa.
I agree, but unfortunately I forgot to mention in my original email
that the assumption here is that the US office has no internet
connectivity whatsoever.