Listeners define how PMTA accepts incoming SMTP traffic. While port 25 is the standard for server-to-server communication, port 587 is often used for client submissions.
Send a test email using sendmail or a tool like MailWizz to ensure DKIM/SPF are working correctly 1.2.2 .
<domain *> dkim-sign yes # Enable DKIM signing use-starttls yes max-msg-rate 10000/h max-cold-virtual-mta-msg 25000 resolve-mx yes sample powermta configuration file hot
per connection can prevent temporary blocks during a server warm-up phase. Backoff Mode : Enabling smtp-pattern-list
<virtual-mta name="mta-tx-1"> <host-name>tx1.yourdomain.com</host-name> <smtp-port>25</smtp-port> </virtual-mta> Listeners define how PMTA accepts incoming SMTP traffic
<domain gmail.com> max-smtp-out 20 vmta ent-flash, vip-luxury max-msg-per-connection 10 bounce-handler gmail-bounce </domain>
Separating your traffic into Virtual MTAs ( virtual-mta ) is critical. If you mix your corporate transactional emails with marketing emails, a single block from Hotmail will halt all operational emails. The configuration creates a pool-hot-traffic group, allowing PMTA to load-balance outbound emails evenly across multiple clean IP addresses. 3. Smart Back-Off Settings <domain *> dkim-sign yes # Enable DKIM signing
When dealing with PowerMTA (pmta), a "hot" configuration usually refers to a setup optimized for , warm-up management , and high-throughput . It is not just about sending fast; it is about sending smartly to maintain sender reputation.
<domain outlook.com> <domain hotmail.com> <domain live.com> <domain msn.com> max-smtp-out 10 max-connect-rate 2/m max-msg-per-connection 50 max-msg-rate 200/h retry-after 5m </domain>