Hot ~repack~: Sample Powermta Configuration File

<vmta vip-luxury> auto-fill-queue false max-smtp-out 20 bind-address 192.168.1.10 smtp-service-pattern vip </vmta>

<acct-file /var/log/pmta/acct.csv> records d,o,b,r,t </acct-file>

# --- General Server Options --- host-name ://yourdomain.com postmaster abuse@yourdomain.com run-as-root no # --- Performance & Resource Management --- # Limits for high-volume environments max-smtp-out 500 # Global limit for simultaneous connections max-msg-per-connection 100 # Optimal for most major ISPs max-errors-per-connection 10 # Prevent blacklist triggers on invalid lists # --- Logging & Management --- # Recommended to keep monitoring separate http-mgmt-port 8080 http-access 127.0.0.1 monitor http-access your.admin.ip.here admin move-interval 5m max-size 50M delete-after 8d # --- Virtual MTA Setup --- # Bind to specific IP for reputation management smtp-source-host 1.2.3.4 ://yourdomain.com domain-key 2024,*,/etc/pmta/://yourdomain.com.key # --- Domain Specific Limits (The "Hot" Part) --- # Customizing for big providers to avoid blocks max-smtp-out 20 max-msg-per-hour 5000 retry-after 10m max-smtp-out 10 max-msg-per-hour 2000 use-starttls yes # --- Delivery Settings --- deliver-only no Use code with caution. Copied to clipboard Key Setup Tips

: Specifies the absolute path where PMTA will look for new message files. virtual-mta : Assigns the mail dropped in this folder to a specific VirtualMTA (IP pool and domain settings) for delivery. scan-interval sample powermta configuration file hot

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max-deliveries-per-connection 20 max-delivery-threads 200 max-message-size 52428800 ; 50MB max-queued 200000 log-level info delivery-queue /var/spool/pmta/queue statistics true statistics-file /var/log/pmta/stats.log pid-file /var/run/pmta/pmta.pid

max-msg-per-connection : Keeps a single connection open for up to 1000 messages, reducing the TCP handshake overhead significantly. scan-interval This public link is valid for 7

A "cold" or default PMTA config suffers from:

<domain *> dkim-sign yes dkim-identity @mydomain.com dkim-private-key-file /etc/pmta/keys/mykey.pem spf-envelope-from mydomain.com </domain>

provider yahoo address abuse+yahoo@example.com action feedback-to-pipe pipe /var/spool/pmta/fbl/yahoo.pipe Can’t copy the link right now

: For hot IPs, retrying deferred emails every 15 minutes ensures that temporary greylisting or connection timeouts are cleared quickly without clogging the queue. Best Practices Before Deploying a Hot Configuration

To avoid being blocked by major ISPs like Gmail or Yahoo, you can set specific limits on how fast your server sends mail.

vmta main-sender auto-warmup true pool pool-high-volume dkim-signature "main" # See DKIM section below always-allow-vmta-domain true max-smtp-out 200 queue-type shared

<http-management> # Bind to localhost only for security. Use an SSH tunnel for remote access. http-access "127.0.0.1:8080"

# Listens on all available IPs on port 25 smtp-listener 0/0:25 # Optional: Listens on port 587 for authenticated users smtp-listener 0/0:587 Use code with caution. Copied to clipboard 3. Virtual MTAs (VMTAs) and IP Pooling