Two approaches:
1) Do what you did before Postfix 3.0.0. That stuff still works.
2) Build and install Postfix once; that is the first instance. Then
use MULTI_INSTANCE_README to create the second Postfix instance.
The two instances share the daemon_directory, command_directory,
etc., but each instance has its own queue, configuration and
data directories.
If your distribution has broken the features that MULTI_INSTANCE_README
depends on,
- Manually add the second instance's configuration directory to
the first instance's alternate_config_directories setting.
Wietse
