One of my clients ask me to set-up a multi server, scalable email system.
I can configure multiple servers to send emails. By using PHP Mysql based login script, users will be redirected to each email server with a login cookie. Domain SPF has all those servers so it can send emails without any issue. (All servers are using a single domain name)
But the problem is when it receives emails MX records can only forward emails to a single server. Is there anyway to forward emails to selected servers.
Or is there any other way to achieve this?
I'm going to use Ubuntu/Debian Postfix, Dovecot, roundcube.
Thanks for any answers in advance.
Note - I think
postfix's Transport map is the way to go. But I'm not sure how to configure database and local-part based relay routing.