Powermta Configuration Guide Top

<virtual-mta transactional-pool> ip 203.0.113.20 ip 203.0.113.21 max-smtp-out 200 max-msg-rate 100/s </virtual-mta>

To track which recipient bounced, use Variable Envelope Return Path (VERP). powermta configuration guide top

: If possible, place your spool directory on an SSD or NVMe drive. max-queue-size &lt;virtual-mta transactional-pool&gt; ip 203