DR Plan Question

[Jason Jacobsen]

I am working on a DR solution for our mail systems. We have two systems with virtually identical configurations and each will have a DR server.  Our mail system runs on Red Hat EL 3.0 and uses the postfix mta, cyrus-imapd, and mysql for authentication.  We replicate the production server to our backup server nightly using rsync.  The basic plan I have for DR is to have each production mail server queue mail for the other in the event the server is not reachable.  We can then make an internal dns change to allow the mail to be redirected to the dr machine in the event of a failure.  Also at this point we will redirect the external ip of the production mail server to the internal ip of the dr machine on our firewall.  This will effectively roll us over to the dr box in the case that the production sever fails without losing new messages sent after failure.  The problem I am facing is when the production server is repaired I would need to synchronize the mail from the dr machine to the production machine to ensure no mail is lost.  Some of our users use imap and some use pop3.  Thank you in advance for any suggestions and let me know if there is any other information I can provide.

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