host-name : Defines the server's hostname (e.g., mta.domain.com ).
You can edit this file directly on your server using a text editor like (e.g., nano /etc/pmta/config ) or download it to your local machine via an FTP client like WinSCP to edit with Notepad++ before re-uploading. Core Configuration Sections powermta config file link
The PowerMTA (PMTA) configuration file is the core component of the PowerMTA SMTP server, where almost all critical operational settings—from IP rotations to delivery throttling—are managed. Essential PowerMTA Config File Locations host-name : Defines the server's hostname (e