| Command | Purpose | | --- | --- | | pmta reload | Reload configuration without stopping | | | service pmta restart | Full restart (use only when necessary) | | | pmta show queues | Display queue status and stuck messages | | | pmta pause queue domain.com/* | Suspend delivery to a specific domain | | | pmta show vmtas | Monitor all Virtual MTA statuses | | | pmtad --debug | Run in debug mode for troubleshooting | |
domain-macro microsoft hotmail.com, live.com, msn.com, outlook.com <domain $microsoft> queue-to hotmail.queue </domain> <domain hotmail.queue> route hotmail.com max-msg-rate 1000/h max-connect-rate 10/h </domain>
I can provide specific rate limits (max-smtp-out) based on your answer. PowerMTA Server Setup | Send 100K+ Emails Daily sample powermta configuration file hot
When a recipient server returns a "421 Rate Limit Exceeded" error, PowerMTA uses its internal ruleset to trigger a "backoff" mode. The directives backoff-retry-after and backoff-to-normal-after gracefully slow down delivery to that specific provider, letting your IP reputation cool down without manual administrator intervention. Best Practices for Implementation
To avoid instant blacklisting when sending high volumes, blocks are used to set specific, lower limits for ISPs like Gmail, which helps manage reputation, as detailed in. 4. Authentication | Command | Purpose | | --- |
: Grants permission to your local applications or email marketing software to route traffic through PMTA.
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# High-Volume "Hot" PMTA Configuration Sample port 8080 host 127.0.0.1 allow 127.0.0.1 # Define Virtual MTAs and Pooling smtp-source-ip 1.2.3.4 host-name ://domain.com virtual-mta vmta-ip1 # High-Performance Settings max-message-size 10M max-smtp-out-connections 1000 max-messages-per-connection 100 max-connect-rate 100/m # Domain-Specific Throttling max-smtp-out-connections 50 max-messages-per-connection 50 max-smtp-out-connections 100 Use code with caution. Key Components of the "Hot" PMTA Configuration 1. Virtual MTAs and IP Pooling
Register your IP ranges with Microsoft's Smart Network Data Services (SNDS) to view real-time spam complaint rates and IP reputation status. Sign up for the Junk Mail Reporting Program (JMRP) to receive immediate feedback when users mark your mail as spam.