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Install Send Only SMTP Server

Setup a Postfix Send Only SMTP Server

Note that in recent years, this has become increasingly more unreliable due to many cloud providers blocking outbound SMTP by default.

But, if you still want to try, then the commands for Ubuntu are

sudo apt install mailutils

A postfix config screen should appear,

Choose internet site from the choices.

Enter the mail servers name, I will use my existing Prometheus domain I've already setup.

Then configure postfix by calling

sudo nano /etc/postfix/main.cf

scroll to the bottom, and set

inet_interfaces = loopback-only
inet_protocols = ipv4

restart postfix

sudo systemctl restart postfix

try sending an email from the command line,

echo "This is the body" | mail -s "This is the subject" -a "FROM:[email protected]" your@email-address

Check your SPAM folder.

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