Hello, actually I have n mail servers, every mail server host n
domain. Every user can send email using authentication and connecting to
the right server (simply using mail.domain.tld as smtp server, that
point to the right server via DNS). So every server has it's own DB
(virtual users with MySQL).
I'd like to have many smtp proxy in front of these n servers that
authenticate to the right server "behind" so I can scale with round
robin the smtp out for the customers.
Actually I scale the infrastructure with x servers with imap/pop3 proxy
(and roundrobin), and y mx servers with transport_maps, but I'm not sure
how to accomplish this for smtp out.
I don't like the idea to have a single big db of users, so ideally a
proxy configuration that authenticate to the right server and let the
client talk to re right server will be fine, any starting point?
Oh, obviously postfix as smtp server and MySQL for the DB. Thanks for
any idea.
