Next, disable SELinux (for RHEL-based systems) as it can interfere with PowerMTA's ability to bind to ports.
Pointing your delivery subdomain (e.g., ://yourdomain.com ) to the server IP.
4 cores minimum (8+ cores recommended for high-volume delivery).
CentOS 7 / 8, AlmaLinux 8 / 9, Rocky Linux 8 / 9, or Ubuntu 20.04 / 22.04 LTS.