Powermta Configuration Guide May 2026

<log-file /var/log/pmta/pmta.log> level info </log-file> Virtual MTAs isolate delivery streams. Define them with custom IPs, throttles, and queues.

<domain aol.com> max-smtp-out 10 max-msg-rate 100/h </domain> DKIM Signing <domain example.com> dkim-sign yes dkim-selector myselector dkim-key-file /etc/pmta/dkim/example.com.pem </domain> Generate DKIM key: powermta configuration guide

openssl genrsa -out example.com.pem 2048 openssl rsa -in example.com.pem -out example.com.pub -pubout PowerMTA does not generate SPF; that’s done by DNS. But you can set envelope sender: &lt;log-file /var/log/pmta/pmta

<log-file /var/log/pmta/panic.log> level panic </log-file> level info &lt

<virtual-mta transactional> vmta-name transactional source-ip 192.0.2.10 max-smtp-out 50 max-msg-rate 10000/h queue-type FIFO </virtual-mta> <virtual-mta marketing> vmta-name marketing source-ip 192.0.2.20 max-smtp-out 200 max-msg-rate 50000/h queue-type FIFO </virtual-mta>

<source 127.0.0.1> return-path bounce@example.com </source> PowerMTA captures DSNs and can route bounces to a local script or mailbox.