How to Build a Secure Homelab SMTP Relay with Postfix and SMTP2GO
This guide creates one private SMTP endpoint for servers, printers, UPS
appliances, monitoring tools, and applications. Internal devices send simple
SMTP to Postfix; Postfix authenticates securely to SMTP2GO for internet
delivery.
It is part of a three-article series:
* Why I moved my homelab SMTP relay from Microsoft 365 to
