As far as I know, the bitnami instance does not ship with an SMTP server. edX uses Amazon SES for our email purposes, so I don't think you'll find edX-made automation for setting up an SMTP server. If you're using google cloud, there might be a django plugin that fits the same API and uses their email service, but you'd have to look. There is also a
postfix-queue role in the configuration repo for forwarding to an external SMTP server, but you should read through it and make sure it'll play nicely on your system.
Max Rothman
DevOps Engineer, edX