PowerMTA is a high-performance email transfer agent (MTA) designed to handle large-scale email delivery with precision. At the heart of its performance is the config file, typically located at /etc/pmta/config .
domain-mapping *.edu { max-smtp-out 2 max-msg-rate 500/h throttle-delay 200ms } sample powermta configuration file
# Set the hostname reported to other servers hostname mail.example.com PowerMTA is a high-performance email transfer agent (MTA)
Configuring PowerMTA (PMTA) correctly is the difference between high-volume inboxing and being instantly blacklisted. The main configuration file, typically found at /etc/pmta/config , acts as the "brain" of your MTA. The main configuration file
# Retry logic: How long to keep trying to deliver the email max-retries 5 retry-after 10m
virtual-mta hotmail-pool smtp-service outbound source-ip 192.0.2.10 192.0.2.11 192.0.2.12 # Rotate source IPs max-smtp-out 30 max-msg-rate 20000/h # Soft throttle max-msg-rate-per-connection 10 connect-timeout 30s idle-timeout 60s use-starttls yes require-tls false dns-timeout 10s