James B. Byrne:
> I began the process of building P-3.0 to the extent of preping a mock
> build spec file. However, reading the README file with 3.0 gave me
> serious pause. Rightly or wrongly as I read it I began to feel that
> 3.0 was not going to be a simple drop in replacement for 2.11.
>
> Are my anxieties misplaced? Can I just build and package 3.0 as I
> have done previously with 2.11 and just install it as a simple (no
> configuration changes) update over an existing 2.11 installation?
You leave the old config files in place, install the new Postfix,
then do "postfix upgrade-configuration".
It is drop-in compatible by default. The backwards compatibility
will keep old default settings active until you decide to freeze
the old defaults or to adopt the new defaults.
Wietse