Voytek:
> On Sat, December 30, 2017 3:51 am, Wietse Venema wrote:
>
> > You should be able to build the new Postfix, use the old config
> > files, do 'postfix upgrade-configuration", and look for warnings while
> > Postfix handles email for several days, about things that
> > might break when you were to set compatibility_level=2.
>
> hmm, I am not sure I have done 'postfix upgrade-configuration"
>
> can I run it possibly second time ?
You can run it many times (the operation is idempotent).
> does it only if need changes main.cf ?
It adds or updates some main.cf parameter settings, and if the old
Postfix version is old enough, also adds required services to
master.cf.
> > That only moves the old system into the new era. If you don't need
> > any of the newer features such as postscreen, then you're done.
>
> where to look for advice/tips etc on postscreen config
The mechanics are explained in www.postfix.org/POSTSCREEN_README.html,
and case studies are found with a search engine.
Wietse
