How to configure Postfix to relay mail through Gmail (simple step-by-step guide)

If you run Linux servers that need to send alerts, backup reports, or monitoring notifications, configuring SMTP can be a pain. I wrote a short guide explaining how to install and configure Postfix with Gmail as an SMTP relay , including: • Installing required packages • Configuring TLS • Setting up Gmail app passwords • Securing credentials • Testing email delivery Good for small servers, homelabs, monitoring tools, and UPS notifications. https://www.alanbonnici.com/2026/03/install-and-configure-postfix-using.html