Notice the dkim-sign yes directive. In the modern email landscape, unsigned mail is often discarded immediately. This config assumes you have your private keys mapped, ensuring every outbound packet is authenticated. 3. Optimized Virtual MTAs (vmta)
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 sample powermta configuration file hot
By grouping IPs into virtual-mta pools, you can rotate your sending identity. If one IP gets "cold" (low reputation), you can shift traffic to another pool without rewriting your entire application logic. 4. Advanced Bounce Handling Notice the dkim-sign yes directive
This article provides a comprehensive, high-performance "hot" configuration for PowerMTA (PMTA). When we say a configuration is we mean it is optimized for high-volume throughput, excellent deliverability, and real-time bounce/FBL handling. Best Practices for Deployment By grouping IPs into
The "hot" secret to PowerMTA is not treating every recipient the same. Gmail, Yahoo, and Outlook have vastly different spam filtering thresholds. By splitting them into blocks, you can throttle your speed for sensitive providers while blasting high volumes to more "lenient" ones. 2. DKIM Integration