My general questions are, there is any possible configuration or hack for it to stop being received as Junk/Spam? There is any configuration or hack we could do to be able to reach/reply to a non-local machine?
Some manuals like of FreeBSD says that there are flags hidden from manual:
"There are some flags that are not documented here. Most are not useful to the general user."
Which commands are those? Or what other useful purposes could main(1) achieve or for what/how do you use mail(1) for?
I'm often pipelining commands into mail(1) to have an easy and fast log or backup about something. `history | mail -s 'history' [email protected]`