Miles Fidelman:
> > To find solutions, open your favorite search engine and try "cyrus
> > mailbox replication", "dovecot meailbox replication", and so on.
>
> I've been wondering about this too, and it strikes me that "mailbox
> replication" is only relevant to local delivery. What about replicating
> the various intermediate mail queues? (My current HA setup is brute
> force - a failover virtual machine, with a completely replicated file
> system. But I've been looking for ways that are more granular, and that
> are easier to do across two separate data centers.)
Have you considered the following:
- Inbound mail spends a fraction of a second in the queue.
- Inbound mail spends days or weeks or more in the mailbox.
- If an MTA goes down, mail flows via alternate MX hosts.
- If the mailbox store goes down, then you have no mail.
That's why high availability focuses on the mailbox store,
not on the MTA in the middle.
Wietse
