Powermta Configuration Guide Top Jun 2026

Setting up PowerMTA (PMTA) correctly is vital for high-volume email delivery and maintaining a strong sender reputation. As of 2026, the configuration must prioritize strict authentication (SPF, DKIM, DMARC) and intelligent throttling to meet modern ISP requirements . 1. Core Prerequisites

<bind source-vmta="newip1" destination-domain="gmail.com"> <limits> throttle 2000/hour </limits> max-smtp-out 10 </bind> powermta configuration guide top

| Feature | Configuration Focus | | :--- | :--- | | | Ensure Reverse DNS (rDNS/PTR) matches your smtp-source-host . ISPs will reject mail without a valid PTR record. | | Queues | Use `pmta Setting up PowerMTA (PMTA) correctly is vital for

max-msg-rate 50/s # 50 messages per second total across all IPs. A safety cap to prevent you from accidentally

A safety cap to prevent you from accidentally burning your IPs.

error-throttle reduces sending when ISP rejects (hard bounce), defer-throttle cuts rate on soft errors.