>> How would I do this for smtpd_recipient_restrictions? > > > That question makes no sense. Rephrase.
I was looking for a general solution. I picked an example. But I apparently picked a bad example because the solution seems to be example specific. I guess I better not pick examples, anymore. How do I get contents inserted into the main.cf file from another file, IN GENERAL, without having to rebuild main.cf and do a reload every time?