> This splits into two use-cases:
> 
>     * Relay
> 
>       - Each server accepts mail for the other's domains, and relays
>         them to the right server. All you need is access to a table
>         of valid recipients for the relay domains, and table of
>         said domain names.
> 
>     * Full-service:
> 
>       - Each server accepts mail for all the domains, and delivers
>         to the correct mail store. Need fully unified data model.
> 
> Which use-case are you aiming for?
> 

definitely full-service. I do not understand whan you say that I need a
fully unified data model.


>> - both servers need to check against both databases for valid
>> destinations
> 
> Correct (s/destinations/user-addresses/).

ypu're right.

>> - each server must know if delivery is to be local or it has to be
>> relayed to the other server.
> 
> Postfix does that automatically. Just add the domain to "relay_domains"
> and not to virtual_mailbox_domains, or similar.

ok.

>> - one server virtual_transport=maildrop (to courier-imap), the other
>> =dovecot (we are going with dovecot for the future, the one with courier
>> is older, but plenty of users)
> 
> The difference in final delivery mechanisms is immaterial.

Great!!!


So, can you point me to the right direction in learning how to get the
full-service configuration done?

Thanks!!

Ignacio

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