Powermta Configuration Guide Top __hot__ 〈SAFE — TRICKS〉

: Defines how many simultaneous SMTP connections can be active. If you have a large IP pool, increase this. max-message-size : Limits the size of emails.

The "secret sauce" of PowerMTA is Backoff mode. It prevents you from blasting ISPs who are temporarily rejecting your mail.

You must generate keys and point PowerMTA to them. This is typically done inside a VirtualMTA block. powermta configuration guide top

: smtp-listener 0/0:2525 (Port 2525 is often used for incoming mail from your application).

Check /var/log/pmta/log daily for unexpected ISP blocks. To help tailer this setup, let me know: What volume of email do you plan to send daily? : Defines how many simultaneous SMTP connections can

<source 127.0.0.1> always-allow-relaying yes process-x-virtual-mta yes max-message-size unlimited smtp-service yes </source>

In modern email delivery, unauthenticated mail is usually junked or rejected. PowerMTA provides native support for signing outgoing messages. Native DKIM Signing The "secret sauce" of PowerMTA is Backoff mode

<acct-file /var/log/pmta/acct.csv> records d,b,r,f # d=delivery, b=bounce, r=received, f=feedback loop pipe "/usr/local/bin/bounce-processor.php" max-size 50M move-interval 5m </acct-file>

Before making any changes, always create a backup of your working configuration file. PowerMTA requires a service restart or a configuration reload ( pmta reload ) to apply most changes. 2. Essential Top-Level Directives

Modern PowerMTA setups often use the HTTP API for better throughput and easier integration than SMTP.

<domain *> max-msg-rate 5000/h max-connect-rate 100/h </domain>