Powermta Configuration Guide Top Link

Security is paramount. An open relay will get your server blacklisted immediately.

<domain gmail.com> max-smtp-out 20 # Concurrent connections max-message-rate 1000/h # Messages per hour per VMTA vmta "marketing" <limit> max-data-errors 5 </limit> </domain> powermta configuration guide top

Fields: d =delivery, s =size, r =response, b =bounce type. Security is paramount