PowerMTA (PMTA) is a highly flexible Mail Transfer Agent (MTA) designed for high-volume email delivery. The core of its functionality lies in the config file, typically located at /etc/pmta/config.
<sender user@marketing.example.com> vmta hot-vmta max-msg-rate 20000/hour max-conn 400 bounce-sender bounces+marketing@example.com sample powermta configuration file hot
: Sets how often (in seconds) PMTA checks the folder for new files. delete-after-read : If set to PowerMTA (PMTA) is a highly flexible Mail Transfer
max-per-host-out, max-smtp-out)The hottest change from defaults: max-per-host-out 100. Standard config uses 20. Bumping to 100 allows simultaneous delivery to large ISPs like Gmail. However, never exceed 200—Google’s postmaster guidelines suggest 100-120 per IP. : Sets how often (in seconds) PMTA checks
If you stumbled upon this article searching for a "sample PowerMTA configuration file hot," you aren't looking for a basic setup. You are looking for performance. You are looking for the kind of configuration that handles millions of messages, navigates complex throttling rules, and keeps your sender reputation pristine.
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