Powermta Configuration - Guide Top ((install))

Proper DNS and authentication are mandatory for inboxing in 2026.

<domain *> bounce-verp-address "bounce+$r@bounces.mydomain.com" bounce-verp-pattern "$r+$h@bounces.mydomain.com" # Critical: Only VERP for hard bounces to save resources bounce-verp-on-hard yes bounce-verp-on-delay no </domain> powermta configuration guide top

disk-queue /var/spool/powermta # Ensure this is on a fast SSD, not HDD. Proper DNS and authentication are mandatory for inboxing

<source 10.0.0.0/8> allow-relay yes </source> Add * soft nofile 65535 and * hard

: Increase the file descriptor limit to handle thousands of concurrent connections. Add * soft nofile 65535 and * hard nofile 65535 to /etc/security/limits.conf . ⚙️ Core Configuration ( /etc/pmta/config ) The main configuration file is located at /etc/pmta/config . 1. General Settings Define who the server is and where it listens for mail. Host Name : host-name mail.yourdomain.com

: 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