On 12/3/18 5:57 PM, Dan Ritter wrote:
This is called a Secondary MX, although you can have any number of them.
Yes, I've done that before. But then what?
* Set up something more clever that keeps the primary and backup in sync so
both IMAP servers hold the same messages.
High-availability is hard, although this is the easiest case:
you list both machines in your MX records, and have your MTA
deliver to a shared filesystem. DRBD is the usual choice.
Dovecot has a replication feature I might play with.
First, I need at least a cold-spare: a complete Postfix and Dovecot
server that I can point my DNS records to. And my clients (only my wife
and I) can point our clients at it as a completely e-mail server. I
think that's the first step.
Maybe I go to secondary MX and Dovecot replication after that, donno yet.
-kb
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