Hey Alexandre,

You can achieve your idea setting a MySQL instance, for example, in each one of your servers and also a Dovecot instance in each of them. Then you can set your `imap.mymaindomain.com` server to be a imap-frontend that performs a pre-auth step in the correct MySQL and then forwards the request to the right Dovecot instance that performs the auth again.

Something like this:

- Request arrives in `imap.mymaindomain.com`

- Check if you host the informed domain

- Check then user domain, for example foo@A.com

- Validate user credentials in MySQL.A

- Forward the request to Dovecot.A

Regards,

João Paulo Bastos

DevOps Engineer at MAV Tecnologia

Belo Horizonte - Brazil
+55 31 99279-7092

@joaopaulosr at OFTC/Freenode

On Wed, Oct 3, 2018 at 10:42 AM Alexandre Ellert <ellertalexandre@gmail.com> wrote:

Hi,

I've got no answer.. Can someone please help ?

Thank you.

Alex

Le mar. 18 sept. 2018 à 22:55, Alexandre Ellert <ellertalexandre@gmail.com> a écrit :

Hi,

I'd like to achieve the following setup whit dovecot using multiple servers :
- one server dedicated to all client IMAP (TLS) connections (i map.mymaindomain.com, see below )
- each backend server has it's own local storage. no replication
- each backend server responsible of a few domains
- each backend server has it's own Mysql local database for user's passwords.

===> Server 1 : domains A, B and C

====> i map.mymaindomain.com ===> Server 2 : domains D, E and F
(143 TLS / 993 SSL)
===> Server 3 : domains G, H

For example, if a user connects from domain E to i map.mymaindomain.com, will Dovecot be able to use password database hosted on Server 2 ?

Thank you !

Alex