By explicitly defining smtp-source-host , you ensure that PowerMTA binds to the correct local IP. This is vital for multi-IP servers to ensure that the Reverse DNS (rDNS) always matches the IP address being used. Best Practices for Deployment
smtp-source smtp-source-inject default-virtual-mta vmta-pool-1 # allow anyone from localhost or specific app server IP allow-ip 127.0.0.1 allow-ip 10.0.0.5 sample powermta configuration file hot
# --- Basic Server Info --- host-name mail.yourdomain.com license-key "YOUR-LICENSE-KEY-HERE" By explicitly defining smtp-source-host , you ensure that
Replace placeholders (like your-ip , your-domain.com , your-dkim-selector ) with your actual values. By explicitly defining smtp-source-host