Sample Powermta Configuration File Hot Review

Check the logs in /var/log/pmta/ if you experience issues; especially panic.log for fatal errors and acct.csv for delivery statuses.

In the world of high-volume email delivery, PowerMTA (PMTA) by SparkPost is the gold standard for MTA (Mail Transfer Agent) software. However, a standard, out-of-the-box configuration will not survive a modern sending environment. To handle millions of emails per hour, you need a —one that is aggressively tuned for throughput, DKIM signing, bounce handling, and ISP throttling.

# ============================================================================== # POWERMTA CONFIGURATION FILE - OPTIMIZED FOR HOT / WARM IPs # ============================================================================== # --- Global Settings --- text-log-mode 0644 run-as-user pmta import-etc-hosts no # --- Network & Binding Listeners --- http-mgmt-port 8080 http-access 127.0.0.1 admin http-access 192.168.1.0/24 admin smtp-listener 0.0.0.0:25 smtp-listener 0.0.0.0:587 # --- Storage & Performance Optimization --- spool-dir /var/spool/pmta log-file /var/log/pmta/pmta.log max-msg-rate 50000/h max-smtp-out 2000 cpu-workers 4 # --- Authentication & Security --- always-allow-relaying yes smtp-service yes log-connections yes log-commands no always-allow-relaying yes smtp-service yes # --- Virtual MTA & IP Binding Definition --- smtp-source-ip 192.168.1.50 host-name ://yourdomain.com smtp-source-ip 192.168.1.51 host-name ://yourdomain.com virtual-mta vmta-hot-01 virtual-mta vmta-hot-02 # --- Bounce & Retry Policies --- bounce-max-age 2d bounce-retry-interval 15m # --- Global ISP Delivery Directives (The "Hot" Rules) --- max-smtp-out 500 max-msg-per-connection 100 max-errors-per-connection 10 retry-interval 20m # --- ISP Specific Optimizations --- # Yahoo! & AOL (Verizon Media) max-smtp-out 80 max-msg-per-connection 150 max-msg-rate 120/m bounce-retry-interval 10m # Gmail / Google Workspace max-smtp-out 100 max-msg-per-connection 200 max-msg-rate 200/m use-starttls yes require-starttls no # Microsoft (Outlook, Hotmail, Live, MSN) max-smtp-out 50 max-msg-per-connection 50 max-msg-rate 60/m retry-interval 15m # --- DKIM Signing Integration --- domain-key dkim-selector, yourdomain.com, /etc/pmta/keys/yourdomain.com.dkim-selector.pem # --- Accounting & Delivery Logs --- move-interval 1h move-to /var/log/pmta/archive/ records d,b,r Use code with caution. Key Configuration Breakthroughs for Hot IPs

Access it via http://YOUR_IP:8080 to track live delivery. sample powermta configuration file hot

<virtual-mta vmta-warm-2> smtp-source-host 203.0.113.21 vmta-warm-2.yourdomain.com

# Retry logic for transient failures bounce-after 4d12h # Keep trying for 4.5 days before permanent failure retry-after 10m # Initial retry interval (dynamic backoff thereafter)

📧 Stop Hitting Spam! The "Hot" PowerMTA Config You Need. Check the logs in /var/log/pmta/ if you experience

: Highly receptive to parallel connections ( max-smtp-out 200 ) if your engagement metrics are high and your DKIM/SPF signatures are valid.

: Closes and recycles the connection after 20 emails. This prevents a single connection from staying open too long, which is a common footprint of spam scripts. 2. Virtual MTA Pooling

<source 0/0> always-allow-relaying yes process-x-virtual-mta yes # Allows the injection source to pick the VMTA Use code with caution. Copied to clipboard Best Practices for High-Volume Delivery To handle millions of emails per hour, you

A standard configuration focuses on identifying your server, setting up listeners for incoming traffic, and defining Virtual MTAs (VMTAs) to manage outbound delivery via specific IP addresses. Sample PowerMTA Configuration Breakdown

A "cold" or default PMTA config suffers from:

# Authentication: Enable DKIM signing for all domains (if a key is set) dkim-sign yes

If you want, I can:

5 Key PowerMTA Configuration Tips for Optimal Performance - Bird