On Fri, 27 May 2005, Giuliano Gavazzi wrote:
> I'd like to do that too.. there is one problem though. I use IMAP, of course,
> so messages are left on the server. The problem is that you want to maintain
> some consistency, and allow deletes at least on one server, say the "primary".
> Supposing the "secondary" only allows modifications to the "sent" mailbox, so
> that sent messages can be saved there, what happens when the user deletes
> messages from the "primary" server? How do you propagate those to the
> "secondary"? And how do you synchronise the status?
You can't perfectly replicate a mailbox with pure IMAP because it doesn't
allow you to set metadata like message numbering. This is why our mail
system uses a custom protocol for replication. It's a one-way replication
mainly aimed at providing a live backup - i.e. not load balancing. The
latter needs two-way replication which is much harder from the conflict
resolution point of view. This stuff should be appearing in the standard
Cyrus distribution soon.
http://www.cus.cam.ac.uk/~fanf2/hermes/doc/talks/2004-02-ukuug/
Tony.
--
<fanf@???> <dot@???>
http://dotat.at/ ${sg{\N${sg{\
N\}{([^N]*)(.)(.)(.*)}{\$1\$3\$2\$1\$3\n\$2\$3\$4\$3\n\$3\$2\$4}}\
\N}{([^N]*)(.)(.)(.*)}{\$1\$3\$2\$1\$3\n\$2\$3\$4\$3\n\$3\$2\$4}}
