Jan-Frode Myklebust schrieb:

Yes, and in ascii-art this becomes :-)
MTA -(lmtp)-->  dovecot-director ---(lmtp)--->  backend-server1
                                \---(lmtp)--->  backend-server2


IMAP-user  -(imap)-->  dovecot-director --(imap) -->  backend-server1
                                       \--(imap) -->  backend-server2
I failed creating a nice ascii view ;-)

However, I have some more questions:

- What happens if the MTA accepted a message but the backend-server fails and is unable to store it?
- What about load-balancing and/or failover?
Maybe all users on backend-server1 are fetching their mails causing high load while backend-server2 is idle. Is it possible to specify more than one backend-server IPs as I can do for the database hosts for userdb queries?

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