dovecot - Jun 2019 - MultiMaster dsync (cluster1 cluster2 cluster3)

Will MultiMaster dsync work fine or will be big problems ?

I configured dovecot to dsync
from serv1 to serv2 to serv3 and repeat to serv1 to serv2 to serv3 and
repeat...

When email received to serv2, it will be synced to serv3, and serv3 will
sync it to serv1, and serv1 will sync it to serv2 and will stop here
because emails matched.

What problems can be with this kind of configuration ?


(except that if one of server(cluster) will be stopped, sync will be
stopped too until cluster is online again)
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> On 14 Jun 2019, at 13.04, Matthew Brown via dovecot <dovecot at
dovecot.org> wrote:
> 
> Will MultiMaster dsync work fine or will be big problems ?
> 
> I configured dovecot to dsync
> from serv1 to serv2 to serv3 and repeat to serv1 to serv2 to serv3 and
repeat...
> 
> When email received to serv2, it will be synced to serv3, and serv3 will
sync it to serv1, and serv1 will sync it to serv2 and will stop here because
emails matched.
> 
> What problems can be with this kind of configuration ?
> 
> 
> (except that if one of server(cluster) will be stopped, sync will be
stopped too until cluster is online again)

It does not scale for that many users. It works fine for thousands of users, and
is probably ok with some ten or twenty thousand users but anything above that is
not recommended.

Sami