Stephen Satchell:
> So, a question: is there a best-practices guide, manual, or book that
> describes how to set up all the modern goodies like DKIM and TLS? What
> I found thus far:
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.
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.
I think the biggest break is smtpd_relay_restrictions because that
was introduced before the compatibility_level safety net. You may
have to explictly set smtpd_relay_restrictions to empty.
Wietse
