In a standard Linux installation (such as CentOS or Ubuntu), the primary configuration file is located at: /etc/pmta/config
The config file is typically split into several logical sections: Sets the global identity of the server. powermta config file link
Essential for modern deliverability. DKIM Config Example: In a standard Linux installation (such as CentOS
http-mgmt-port : Sets the port for the PowerMTA Management Console . powermta config file link
Maps specific IP addresses to distinct sending "identities." This allows you to separate marketing traffic from transactional emails. smtp-source-ip 1.2.3.4 Use code with caution.