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., bu
In the past, including up to 2.11.3, I compiled Postfix
and ran two instances of it with different IPs. One was
an MX, and the other dedicated SMTP. The dedicated
SMTP instance required a unique queue_directory,
slightly different init script, etc. The dedicated SMTP
instance used a config direct
