The transport file

[kilburn]

1. You're right in that the transport maps is one of the places where you should setup this stuff. Remember that you must change BOTH /etc/ispcp/postfix/working/transport AND /etc/postfix/ispcp/transport. Basically, you should add a line there with something like:

Code:

domain.tld     smtp:[your.exchange.ip.address]

Notice that the brackets [] MUST be there (otherwise postfix would try to lookup the MX entry for your.exchange.ip.address and fail miserably).

2. Additionally, you must also remove (or comment) the domain from the local domains list (/etc/ispcp/postfix/working/domains AND /etc/postfix/ispcp/domains).

Once you've applied this changes, postmap the files and reload postfix:

Code:

postmap /etc/postfix/ispcp/{transport,domains}
/etc/init.d/postfix/reload

... and that's it. The server will relay any mails it receives for "domain.tld" to your exchange server.