Nick Warr schrieb:
I think some of the new Dovecot (director?) software is user aware, but I don't know if it's quite ready for production.
Yes, with director it should be something like that:
MTA --(lmtp)--\ /--(lmtp)--> backend1 --
-- director -- -- NFS
MTA --(lmtp)--/ \--(lmtp)--> backend2 --/
IMAP-User --> frontend1 --\ /--(imap)--> backend1 --
-- director -- -- NFS
IMAP-User --> frontend2 --/ \--(imap)--> backend2 --/
So what happens if user1@example.tld receives a mail?
The director decides to connect to backend1 which in turn stores the mail on the NFS share and the index file locally?
Then, user1@example.tld connects to one of the frontends. Does the director know that, earlier, this user received a mail and proxies him to backend1 too?