Postfix as "normal" daemon under 18.04?

[Robert Heller]

How do I get Postfix to run as a "normal" daemon under Ubuntu 18.04?

I installed postfix on a Ubuntu 18.04 server and copied a batch of config 
files from a CentOS 6 system.  But postfix under Ubuntu 18.04 is weird.  The 
main postfix service file (/lib/systemd/system/postfix.service) does not 
actually start the daemon (like it does with a CentOS 7 system), instead there 
is a /lib/systemd/system/postfix at .service file, that gets called to create 
instances.  What is going on here?  Is there some strange and exotic magic 
involved?  Is it not possible to just run postfix as a regular deamon?  

-- 
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