title: How to send mail from Ubuntu server using dockerized mail server
body: <p>I'm looking for a simple way to programmatically send emails from a Linode Ubuntu server (not bulk or spamming, simple iOT type notifications). I have a dockerized postfix/dovecot system up and running, but I don't know how to use that from outside the container. I've looked into sendmail but that seems like duplication since I already have a configured SMTP server. My question is what can I install on my Ubuntu server that will allow me to send simple emails from the command line (script) that uses my existing SMTP server in my docker container?</p>