https://www.youtube.com/watch?v=Tq7q_pttrDw
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sudo apt install postfix bsd-mailx- internet site
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sudo systemctl enable postfix -
sudo systemctl start postfix -
sudo cp /etc/postfix/main.cf /etc/postfix/main.cf.old -
sudo vim /etc/postfix/main.cf→
inet_interfaces=loopback-only -
sudo ufw allow Postfix -
sudo ufw allow "Postfix SMTPS" -
sudo ufw allow "Postfix Submission"
(Eventually test telnet [localhost](http://localhost) 25 to confirm)
mailx email@address.com