OK ... I didn't want to do this, but I did:
Fill out the wizard:
sudo apt-get install postfix
- choose "Internet with smart host"
- fill out FQDN of your host
- fill out your (ISP's) smart host
Set hostname with a FQDN name:
Fill out a resolvable FQDN of your host. I choose a name of remote system / domain I own.
sudo nano /etc/hostname
Save and exit
Reboot your system
Install and use 'mail':
sudo apt-get install mailutils
echo Hello | mail -s "this is a test" email@example.com
... and ... bingo! It works for me