Ubuntu/Debian (example):

PowerMTA will not start without a valid license file. Copy your license file to the configuration directory: cp license /etc/pmta/license chmod 644 /etc/pmta/license Use code with caution. Step 4: Configuring the config File

The installer will extract the binaries, create the necessary user ( pmta ), and set up the default directories.

PowerMTA will not run without a valid license.

These tutorials provide detailed walkthroughs for installing and configuring PowerMTA on various Linux distributions: