<acct-file /var/log/pmta/webhook.json> http-webhook-url https://your-processor.com/webhook records b,d,rb,f </acct-file>
tail -f /var/log/pmta/acct.csv | grep -v "dsn="
This guide covers the essential components of a high-level PowerMTA configuration, focusing on performance, deliverability, and security. 1. The Foundation: Global Settings
<domain yahoo.com> max-msg-per-hour 150000 max-msg-rate 40/second dns-timeout 60 bounce-pattern-file /etc/pmta/bounce_patterns/yahoo.ptr </domain>
<virtual-mta transactional> return-path "bounce-t@yourdomain.com" # Bounce category for tracking </virtual-mta> powermta configuration guide top
Email authentication is mandatory for inbox delivery in 2026. Inbox providers expect proper SPF, DKIM, DMARC, and PTR records before accepting large email volumes.
http-mgmt-port 8080 http-access 192.168.1.50 admin http-access 127.0.0.1 full password-encryption-key "your-secret-salt" user admin admin_secure_password admin Use code with caution.
Gmail prefers fewer concurrent connections but allows higher volumes per connection if your IP reputation is strong.
A foundational best practice in enterprise emailing is isolating different types of traffic (e.g., transactional vs. promotional) and binding them to specific IP addresses. PowerMTA achieves this through the container. <acct-file /var/log/pmta/webhook
Before diving into the configuration guide, let's cover some basics:
However, installing PowerMTA is only the first step. To maximize inbox placement and throughput, you must configure the config.dat file correctly. This guide covers the you need to master to ensure stability and high deliverability.
Microsoft is highly aggressive with aggressive connection thresholds. Exceeding these limits results in immediate 421 RP-001 temporary blocks.
Properly configured DSN reduces reputation damage by handling bounces properly. Inbox providers expect proper SPF, DKIM, DMARC, and
Publish the public key in your DNS TXT record for the selector used ( dkim2026 ).
PowerMTA is widely regarded as the industry standard for high-volume email sending. However, a default installation is rarely optimized for maximum throughput or optimal deliverability.
A standard vMTA configuration defines the IP address and the domain it represents.
Email Infrastructure / MTA Tuning Reading Time: ~12 minutes