Powermta Configuration Guide Top [better]

Assign specific CPU cores to specific domains to prevent cross-domain blocking.

| Feature | Configuration Focus | | :--- | :--- | | | Ensure Reverse DNS (rDNS/PTR) matches your smtp-source-host . ISPs will reject mail without a valid PTR record. | | Queues | Use `pmta

Yahoo requires strict connection throttling and a slower warm-up pace. powermta configuration guide top

max-smtp-out 10 max-msg-per-connection 50 backoff-to-normal-after 30m Use code with caution. 5. Automated Bounce and Backoff Management

Note: Ensure that your DNS TXT record for pmta._://yourdomain.com contains the corresponding public key. 7. Bounce and Feedback Loop (FBL) Processing Assign specific CPU cores to specific domains to

PowerMTA is a high-performance SMTP MTA used for large-scale email delivery. Below is a concise, actionable top-level guide covering installation notes, core configuration, deliverability best practices, monitoring, and sample config snippets to get started.

: Limits the absolute number of messages PowerMTA attempts to deliver per second globally. | | Queues | Use `pmta Yahoo requires

# Define the conditions that trigger backoff backoff-to-normal-after 1h data-availability-check yes # Apply the profile via domain directives backoff-retry-profile standard-backoff # Trigger backoff on common rate-limiting responses backoff-trigger-pattern /rate limit|too many connections|throttled/i Use code with caution. 6. Authentication: DKIM, SPF, and DMARC

smtp-port 25 http-mgmt-port 8080 http-access localhost 10.0.0.0/8 host-name mailer.yourdomain.com max-smtp-out 200 max-queue-size 20G always-allow-relay yes processes 8 max-message-size 25M

$ pmta show queue | head -10 Domain: gmail.com Attempts: 2 Next Retry: 34s Domain: yahoo.com Attempts: 1 Next Retry: 12s

Only allow trusted servers (like your web application) to inject mail.