: Ensure your server IP resolves back to your sending domain. This is critical for avoiding spam filters. 6. Launching and Monitoring Start the PowerMTA service with the following command: service pmta start Use code with caution. Copied to clipboard
/usr/sbin/sendmail -t < /tmp/test.eml
PowerMTA v6.0r3 was installed and configured successfully on a CentOS 7 server. The system is operational for low-to-medium volume email sending (approx. 500k messages/hour). However, due to the age of v6.0r3, significant caveats exist regarding modern TLS standards and IPv6 handling. Immediate upgrade to a supported version is strongly advised for production use. powermta 60r3 install