PowerMTA (PMTA) is not a standard MTA. It's a mail transfer agent optimized for outbound throughput, queue management, and sender reputation. Unlike Postfix or Exim, PMTA is event-driven, asynchronous, and designed to handle millions of connections per hour.
Reverse DNS (rDNS): Ensure your server's IP address resolves back to your sending domain. 3. Monitoring and Management New Features for PMTA 5.0 - SparkPost powermta configuration guide top
: If possible, place your spool directory on an SSD or NVMe drive. max-queue-size PowerMTA Configuration Guide: From Core to Edge (Deep
pmta show queue --domain gmail.com --all
: A policy record that tells receiving servers what to do if SPF or DKIM fails (e.g., p=quarantine TLS Encryption : Configure smtp-tls-certificate : A policy record that tells receiving servers
curl http://localhost:8080/pmta/stats
curl http://localhost:8080/pmta/queues
Configuring PowerMTA (PMTA) effectively requires moving beyond a simple "install and send" mentality to a structured environment optimized for deliverability and scalability 1. Environment Prerequisites
You must generate keys and point PowerMTA to them. This is typically done inside a VirtualMTA block.