<domain *> max-smtp-out 20 use-starttls yes require-starttls no max-msg-rate 100/hour # Fallback for all domains </domain>
In the old days, people just sent mail from the server IP. In modern PowerMTA "hot" setups, we use .
<!-- PowerMTA Configuration Sample: High Volume / High Deliverability --> sample powermta configuration file hot
: 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
PowerMTA performance scales with disk I/O. For high-volume sending (millions of messages daily): Best Practices Before Deploying a Hot Configuration PowerMTA
Below is a configuration designed for a scenario with multiple IPs, DKIM signing, and optimized connection settings to maximize throughput while minimizing risk of immediate blacklisting.
Replace placeholders (like your-ip , your-domain.com , your-dkim-selector ) with your actual values. your-dkim-selector ) with your actual values.
Major Internet Service Providers (ISPs) require distinct connection metrics. Treating a hot IP like a new IP results in throttled throughput, while pushing it too hard triggers blocklists.