postfix with smtp auth on non fqdn host

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postfix with smtp auth on non fqdn host

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Setup: New install of ubuntu-20.10
Internet host on home lan with no real FQDN
postfix ver. 3.5.6

I'm having a heck of a time getting anywhere with a postfix
installation. I've filled out the main.cf several different ways and
added the passwd hash for smtp auth of a SmartHost but instead of
posting my efforts I want to know first, if it really is possible to
set up a working postfix in my no `resolvable FQDN'  situation.  If
so, some URLS or examples would be very helpful.  I have went thru
quite a few already.