Using an SFTP client (like FileZilla or Cyberduck) or the scp command, upload your PowerMTA tar.gz or .deb / .rpm installer file to the /tmp directory of your server.
sudo rpm -ivh powermta-6.0r3.rpm
pmta soft nofile 65536 pmta hard nofile 65536 powermta 60r3 install
Minimum 2 vCPUs (4+ vCPUs recommended for high-volume environments).
The Complete Guide to Installing PowerMTA 60r3: Enterprise Setup and Configuration Using an SFTP client (like FileZilla or Cyberduck)
smtp-listener 0/0:25
by running sudo service pmta restart .
This document follows industry best practices and includes pre-flight checks, dependency installation, configuration basics, service setup, and security hardening.
Then create /etc/pmta/auth.txt with user:password pairs. powermta 60r3 install