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