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Powermta Configuration Guide Top -

<source 127.0.0.1> allow-relay yes </source>

<domain *> retry-after "4xx" 900 # Wait 15 min on temp fail retry-after "450" 3600 # Wait 1 hour on mailbox busy # Exponential backoff retry-scheme linear retry-interval 600,1200,1800,3600 </domain> Many hacked PowerMTA instances are used for spam because relaying is open. Lock it down.

<source 10.0.0.0/8> allow-relay yes </source> Connect to the destination MX before accepting mail from your user. powermta configuration guide top

<domain gmail.com> max-smtp-out 20 # Concurrent connections max-message-rate 1000/h # Messages per hour per VMTA vmta "marketing" <limit> max-data-errors 5 </limit> </domain> <domain outlook.com> max-smtp-out 15 max-message-rate 800/h vmta "marketing" </domain> For new IPs, create a dedicated VMTA that sends only 100 messages then pauses.

<processor-set name="high_volume"> cpu-range 0-3 <domain gmail.com> assign-processor-set high_volume </domain> </processor-set> <processor-set name="low_volume"> cpu-range 4-7 <domain *> assign-processor-set low_volume </domain> </processor-set> Many ISPs greylist unknown senders. PowerMTA can auto-retry with smarts. &lt;source 127

<virtual-mta transactional> group-id 100 <source 203.0.113.10> auto-fast-flush no process-x-header Yes </source> </virtual-mta> <virtual-mta marketing> group-id 200 <source 203.0.113.20> smtp-service fast-flush-delay 2 </source> </virtual-mta> Google (Gmail) and Microsoft (Outlook/Hotmail) have strict acceptance rates. You must throttle.

Introduction: Why PowerMTA Remains the Gold Standard In the high-stakes world of email deliverability, volume is meaningless without inbox placement. PowerMTA (Message Transfer Agent) by Port25 Solutions (now part of SparkPost) has long been the industry’s top-tier MTA for senders who demand speed, intelligence, and granular control. Unlike open-source alternatives like Postfix or Exim, PowerMTA is engineered specifically for outbound email marketing , transactional messaging, and high-volume ESP operations. &lt;domain gmail

# Fallback for subdomains dkim-signer * dkim-default /etc/pmta/dkim/default.key </domain> To track which recipient bounced, use Variable Envelope Return Path (VERP).

<source 127.0.0.1> allow-relay yes </source>

<domain *> retry-after "4xx" 900 # Wait 15 min on temp fail retry-after "450" 3600 # Wait 1 hour on mailbox busy # Exponential backoff retry-scheme linear retry-interval 600,1200,1800,3600 </domain> Many hacked PowerMTA instances are used for spam because relaying is open. Lock it down.

<source 10.0.0.0/8> allow-relay yes </source> Connect to the destination MX before accepting mail from your user.

<domain gmail.com> max-smtp-out 20 # Concurrent connections max-message-rate 1000/h # Messages per hour per VMTA vmta "marketing" <limit> max-data-errors 5 </limit> </domain> <domain outlook.com> max-smtp-out 15 max-message-rate 800/h vmta "marketing" </domain> For new IPs, create a dedicated VMTA that sends only 100 messages then pauses.

<processor-set name="high_volume"> cpu-range 0-3 <domain gmail.com> assign-processor-set high_volume </domain> </processor-set> <processor-set name="low_volume"> cpu-range 4-7 <domain *> assign-processor-set low_volume </domain> </processor-set> Many ISPs greylist unknown senders. PowerMTA can auto-retry with smarts.

<virtual-mta transactional> group-id 100 <source 203.0.113.10> auto-fast-flush no process-x-header Yes </source> </virtual-mta> <virtual-mta marketing> group-id 200 <source 203.0.113.20> smtp-service fast-flush-delay 2 </source> </virtual-mta> Google (Gmail) and Microsoft (Outlook/Hotmail) have strict acceptance rates. You must throttle.

Introduction: Why PowerMTA Remains the Gold Standard In the high-stakes world of email deliverability, volume is meaningless without inbox placement. PowerMTA (Message Transfer Agent) by Port25 Solutions (now part of SparkPost) has long been the industry’s top-tier MTA for senders who demand speed, intelligence, and granular control. Unlike open-source alternatives like Postfix or Exim, PowerMTA is engineered specifically for outbound email marketing , transactional messaging, and high-volume ESP operations.

# Fallback for subdomains dkim-signer * dkim-default /etc/pmta/dkim/default.key </domain> To track which recipient bounced, use Variable Envelope Return Path (VERP).