In the sample above, notice the virtual-mta-pool . If you are sending both marketing newsletters and password reset emails (transactional) from the same server, you are risking your reputation. If your marketing list is dirty, it could get your IP blocked, stopping password reset emails.
<domain gmail.com> max-smtp-out 15 max-msg-rate 30/s use-rs yes smtp-starttls required </domain>
# Access log for engagement tracking <acct-file /var/log/pmta/access.log> acct-format "%d\t%t\t%p\t%s\t%vmta%\t%env-sender%\t%rcpt%\t%status%\t%size%\t%msgid%" acct-file-rollback-size 2G acct-file-rollback-time 86400 </acct-file> sample powermta configuration file hot
A "cold" or default PMTA config suffers from:
Never apply a "hot" configuration to a brand new IP address. Start by sending less than 100 emails per day to Microsoft domains, doubling the volume every few days over a 2-to-4 week period. To help refine this setup for your server, please tell me: How many warmed IP addresses do you have in your pool? In the sample above, notice the virtual-mta-pool
$Id: config 2015-03-24 16:00:00 Jack $. # Sample PowerMTA configuration file. # PowerMTA Multiple Virtual PMTA config file sample. www.huangzhong.ca PowerMTA Configuration: A Step-by-Step Tutorial
# --- 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 <domain gmail
: Always enable use-starttls for providers that support it (like Gmail and Outlook) to encrypt your mail in transit .
Ensure your Mail-From domain, From-Header domain, and DKIM signature domains match up to pass strict DMARC verification policies.
For truly high-performance setups, ensure your PowerMTA spool directory is on an NVMe SSD to prevent bottlenecks during massive bursts.
<!-- Run as a background service --> <spool-enabled>yes</spool-enabled>