Sample Powermta Configuration File Hot _verified_ Link
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http-mgmt-port 8080 http-access 1.2.3.4 monitor # Allow only your admin IP to view logs Use code with caution. Copied to clipboard Step-by-Step Implementation Guide Preparation : Ensure you have a static IP address domain name with the hostname (e.g., mail.yourdomain.com ) set in your server's settings. Install PowerMTA : Upload your RPM or DEB package and install it using rpm -ivh PowerMTA.rpm Place License File : Copy your license.dat /etc/pmta/ Edit the Config YOUR-LICENSE-KEY-HERE with your actual key. smtp-source-ip to your server's public IP. Ensure the matches your domain's rDNS (Reverse DNS) record to avoid being flagged as spam. Set Up DKIM
A standard high-performance PowerMTA configuration is built around several key directives: Virtual MTAs and IP Pooling sample powermta configuration file hot
Instead of copying identical settings for hotmail.com , outlook.com , and live.com , the domain-macro groups them under the alias $microsoft . PowerMTA applies the rules collectively to all matching destinations, conserving server memory and simplifying configuration. 2. Connection Settings ( max-smtp-out )
Opening an SMTP connection involves a "handshake" that consumes time and resources. By sending multiple messages (e.g., ) over a single connection, you significantly reduce the overhead per email. 3. Domain-Specific Throttling </domain> http-mgmt-port 8080 http-access 1
# ========================================================== # PowerMTA Configuration File - High Performance (Hot) # ========================================================== # 1. Server Basics # ---------------------------------------------------------- http-mgmt-port 8080 http-mgmt-host 0.0.0.0 http-mgmt-password your_strong_password license-key xxxxx-xxxxx-xxxxx-xxxxx hostname ://example.com smtp-source-host 192.0.2.1 ://example.com # Primary IP # 2. IP Address & Traffic Management # ---------------------------------------------------------- # Define your IPs here for virtual MTA usage smtp-source-host 192.0.2.2 ://example.com smtp-source-host 192.0.2.3 ://example.com smtp-source-host 192.0.2.4 ://example.com # Create Virtual MTAs (VMTA) for sending smtp-source-host 192.0.2.2 ://example.com smtp-source-host 192.0.2.3 ://example.com smtp-source-host 192.0.2.4 ://example.com # Group VMTAs for load balancing virtual-mta vmta1 virtual-mta vmta2 virtual-mta vmta3 # 3. Performance & Queue Optimization # ---------------------------------------------------------- max-smtp-out-connections 10000 max-smtp-out-msg-rate 5000/h # Increase memory for heavy load max-queue-memory 512M # Spool directory spool-dir /var/spool/pmta # 4. Delivery Rules (The "Hot" Settings) # ---------------------------------------------------------- # Default behavior max-smtp-out-connections 20 max-smtp-out-msg-rate 100/m max-messages-per-connection 100 # Optimized rules for high-volume receivers (Gmail, Yahoo, etc.) max-smtp-out-connections 50 max-smtp-out-msg-rate 2000/m max-messages-per-connection 200 retry-after 10m max-smtp-out-connections 40 max-smtp-out-msg-rate 1500/m max-messages-per-connection 200 # 5. DKIM Signing (Essential for Deliverability) # ---------------------------------------------------------- domain example.com key-file /etc/pmta/dkim.pem selector default # 6. Logging & Monitoring # ---------------------------------------------------------- log-file /var/log/pmta/pmta.log log-rotate 10 100M # Enable delivery logs for analytics acct-file /var/log/pmta/acct.csv acct-file-rotate 10 100M Use code with caution. Detailed Breakdown of Key Settings 1. Virtual MTAs ( )
# Default limits for all domains max-smtp-out 20 max-msg-per-connection 100 retry-after 10m # Specific limits for Gmail to avoid "too many connections" max-smtp-out 5 max-msg-rate 200/h Use code with caution. Copied to clipboard Essential Configuration Tips smtp-source-ip to your server's public IP
# High-Volume "Hot" PMTA Configuration Sample port 8080 host 127.0.0.1 allow 127.0.0.1 # Define Virtual MTAs and Pooling smtp-source-ip 1.2.3.4 host-name ://domain.com virtual-mta vmta-ip1 # High-Performance Settings max-message-size 10M max-smtp-out-connections 1000 max-messages-per-connection 100 max-connect-rate 100/m # Domain-Specific Throttling max-smtp-out-connections 50 max-messages-per-connection 50 max-smtp-out-connections 100 Use code with caution. Key Components of the "Hot" PMTA Configuration 1. Virtual MTAs and IP Pooling
| | What It Does | Google (Gmail) Limits | Microsoft (Hotmail/Outlook) | Yahoo | | :--- | :--- | :--- | :--- | :--- | | max-smtp-out | Concurrent connections to a domain | 10 - 20 per IP | 10 - 20 per IP | 10 - 20 per IP | | max-connect-rate | New connections per minute | 2/m per IP | 2/m per IP | 2/m per IP | | max-msg-per-connection | Messages sent per connection | 50 - 100 | 50 - 100 | 50 - 100 | | max-msg-rate | Message per hour to a domain | 200 - 1000/h | 200 - 500/h | 200 - 500/h |
allows PowerMTA to detect 4xx "soft bounce" errors (like reputation-based throttling) and automatically reduce the sending rate until the ISP's filters relax. Time4Servers Best Practices for Maintenance Five Essential PowerMTA Configuration Tips - Bird
Below is a production-ready PowerMTA configuration template. It defines global optimization settings, virtual MTA (IP) pooling, and specific traffic-shaping rules for Microsoft domains.