How do I add email sending capabilities?

[teekay]

First you need to install a basic MTA, like postfix or sendmail. I'd recommend postfix as it is way easier to setup if the default settings don't do what you want them to do. Sendmail config syntax is masochistic. (Postfix also comes with the binary /usr/sbin/sendmail, so that's compatible)

Then try and see if it works by default by sending a test mail with something like

Terminal

echo "test 1 2 3"|mailx -s "Test Email" receiver@domain.com

Most mail servers block connections from dynamic IPs, so if you have a dynamic IP, you will need to configure mail relaying through the ISPs mail relay gateway.