[Dovecot] replication howto

[Timo Sirainen]

On 19.3.2012, at 12.50, Matteo Cazzador wrote:

> Hi, i've a simple question, what do you mean for dovecot director setup?
> 'i've a doubt.
> The solution that i'm testing is using 3 mail server in different
> geoghrapic locations.
> An user can travel in varius location, and i want his imap mail reside
> on mail server in every locations.
> Sò i use you solution about replication. First server  (by dns record)
> that  receive mail sync it on the other servers, and when
> user consult is mail by imap protocol everything is sync on all servers.
> Do you suggest to use a horizontal structure for it like i explain or
> is better to have a single node external mail server
> and customer locations server like slave?

Dovecot director isn't really meant to be used for geographic user distribution. Also the replication doesn't yet support more than two servers.

A master-slave setup wouldn't have the UID conflict problems that multi-master dsync replication has, but the UID conflicts probably won't be a big problem.

Anyway, difficult to give recommendations about an unfinished feature..