On 4.12.2013, at 6.43, Pizza Napoletana <pizzaiolo@gmx.com> wrote:

Will the replication method described at http://wiki2.dovecot.org/Replication support a master/master/master configuration to keep three replicas in sync?

Not automatically currently. But in theory would be possible, either with some manual scripting (e.g. cronjob to dsync to 3rd server) or patching Dovecot to support mail_replica2, mail_replica3, etc.