Setting up postfix for a split domain
Posted on 2010-01-07
I have a Linux/Postfix mail server currently handling email for many domains. For one of these domains I have 60 or so pop3 accounts most of which are accessed by the SBS POP3 connector for email, but some are accessed directly as the users are not part of the main network (so there are no SBS licences for them - the directors children are some of them)
I want the email for most of the accounts to be forwarded via smtp to the SBS/exchange server without using the pop3 connector but leave a few of the accounts local on the postfix server.
I know how to relay email for an entire domain and how to setup local mailboxes but not how to mix these within a domain. I also need to ensure that email sent from either server can reach recipients on the other server.
I believe this is called a split domain and can setup the exchange end no problem but don't know the postfix config.
Incidentally the server is Slackware 11 with Postfix/Dovecot