Exchange Online Tenant Authorisation Milter (Mail-Filter)

Configure Postfix to use smarthost for mail relaying

Dockerized exim for sending mails to smarthost(s)

Secure SMTP on the horizon 📮

Docker postfix satellite configuration (send email through a smarthost like Gmail)

Postfix configuration file in smarthost (relayhost), for Ubuntu 22.04 LTS

A smarthost is a Mail Transfer Agent (MTA) or mail relay that allows third parties to send emails, which are then forwarded to the recipient's email servers.

Ansible role that installs and configures an authenticated relay