Production vs. Testing.

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

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# Configure the accounting file to log bounces and FBLs <acct-file /var/log/pmta/acct.csv> # Possible values: bounces, feedback, delivered, etc. record bounces,feedback max-size 100M rotate 5 </acct-file>

Enable require-rdns yes on the listener (incoming) to reject connections from IPs without reverse DNS.