The most critical link in PowerMTA is connecting your incoming traffic source (your application or marketing platform) to your outbound IPs (Virtual MTAs). This is achieved using the source directive linked to a virtual-mta or vmta-pool .
virtual-mta vmta-domain1 virtual-mta vmta-domain2 Use code with caution. 4. How to Link DKIM Keys in the Config File powermta config file link
# dkim <dkim> selector default key-file /etc/pmta/dkim/example.com.private </dkim> The most critical link in PowerMTA is connecting
Whenever you modify the main configuration file or any linked external files, you must validate the syntax before restarting the service to avoid unexpected downtime. Step 1: Run a Syntax Check After installation, you may also see auxiliary files
To complete the setup of your PowerMTA config file, you must define or update the following core directives: License Key Path : Point to your valid license file, usually placed at /etc/pmta/license Networking & Listeners
This is the file you edit to control PMTA’s behavior. After installation, you may also see auxiliary files like /etc/pmta/config-defaults (default settings read before the main config) and /etc/pmta/precached-domains for DNS pre‑caching.