# ------------------------------------------------------------------ # PowerMTA Configuration File - High Volume (Hot) Setup # ------------------------------------------------------------------ # --- Basic Settings --- # Replace with your actual server hostname smtp-server-hostname ://yourdomain.com http-mgmt-port 8080 http-mgmt-acl 127.0.0.1 192.168.1.0/24 # Allow access only from trusted IPs log-file /var/log/pmta/pmta.log log-rotate 10 10M # --- Source and Security --- # Define authorized IPs that can send through this PMTA server always-allow-relaying yes smtp-service yes process-x-virtual-mta yes # Optional: Authentication (Recommended if public) # auth-clients auth-user-1 # --- DKIM Signing --- # Assuming your domain is yourdomain.com dkim-key /etc/pmta/yourdomain.com.pem dkim-selector selector1 dkim-sign yes # --- Virtual MTAs (IP Pooling) --- # Define Virtual MTAs for different IPs to spread reputation smtp-source-ip 192.0.2.10 # Replace with IP 1 # Example to add dkim to vmtas # dkim-key /etc/pmta/key1.pem # dkim-selector selector1 # dkim-sign yes smtp-source-ip 192.0.2.11 # Replace with IP 2 # Create a pool to use virtual-mta vmta1 virtual-mta vmta2 # --- Domain-Specific Rules (Hot Settings) --- # Default rules for unknown/other domains max-smtp-out 20 max-msg-per-connection 50 max-msg-rate 500/m # Optimized rules for Major ISPs (High Volume) max-smtp-out 50 max-msg-per-connection 100 max-msg-rate 2000/h # Recommended: Use dedicated IP for Gmail # vmta-pool mta-pool1 max-smtp-out 40 max-msg-per-connection 80 max-msg-rate 1500/h max-smtp-out 30 max-msg-per-connection 60 max-msg-rate 1000/h # --- Performance Tuning --- smtp-out-max-concurrency 1000 smtp-out-max-msg-per-connection 100 smtp-out-max-msg-rate 10000/m Use code with caution. Detailed Directive Breakdown 1. virtual-mta & virtual-mta-pool
Are you looking to optimize this for a specific (like Gmail) or for a bulk marketing scenario?
; Local delivery for bounces and incoming domain-local sample powermta configuration file hot
: Reduces the time dead or deferred mail sits in your queue. For hot traffic, keeping transient mail in the spool for more than 48 hours wastes server resources.
Ensure SPF, DKIM, DMARC, and rDNS are perfectly set up before applying these settings. Sample PowerMTA Hot Configuration File ( /etc/pmta/config ) ; Local delivery for bounces and incoming domain-local
; Sample template for virtual-mta assignment by header/transaction routing-rule high-priority
Use the http-mgmt-port (8080 in the sample) to watch your queues in real-time. If you see a "backoff" status, lower your max-smtp-out immediately. Sample PowerMTA Hot Configuration File ( /etc/pmta/config )
domain yourdomain.com selector dkim1 private-key-file /etc/pmta/dkim/yourdomain.private