Thanks for the reply. As a relative email newbie I can see this is not what I really want. Or rather this is not what I meant by a backup mail server. Since any mail server, as far as I know, will hold mail for days, I don’t really see much point to this type of backup mail server. I’m looking at situations where the primary mail server site won’t be back for months.
What I have is a disaster recovery mirror site. I don’t want a mailqueue that waits until the primary site is back online but rather mailboxes. In other words I need for mail to go to the mirror site when the primary site is down and users at the mirror site to be able to access their mail there.
The main problem is that if a disaster is declared, I know can change the MX records on the secondary DNS server but it will take too long for that change to propagate through the network. I don’t think mail already queued for the primary site will ever be delivered to the backup site either.
At this point I guess I am looking for suggestions.
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