<domain *> # Default for all domains max-smtp-out 5 max-msg-rate 100/h use-starttls if-available </domain> Gradually increase volume per source IP.
Check stats via API:
http-mgmt-port 8080 http-mgmt-interface 127.0.0.1 Always validate config before reload: powermta configuration guide
<source 192.168.1.10> # Warm-up schedule (day 1-30) max-msg-rate 100/h max-smtp-out 5 <schedule warmup> from 00:00 to 23:59 for 1d max-msg-rate 100/h from 00:00 to 23:59 for 3d max-msg-rate 500/h from 00:00 to 23:59 for 7d max-msg-rate 2000/h from 00:00 to 23:59 for 14d max-msg-rate 10000/h from 00:00 to 23:59 for 30d max-msg-rate 30000/h </schedule> </source> 6.1 DKIM Signing <domain example.com> dkim-sign yes dkim-selector mail dkim-key /etc/powermta/keys/example-dkim.key dkim-headers "From:Subject:Date:To" </domain> Generate key: <domain *> # Default for all domains max-smtp-out
openssl genrsa -out /etc/powermta/keys/example-dkim.key 2048 openssl rsa -in example-dkim.key -pubout -out example-dkim.pub # Add public key to DNS: mail._domainkey TXT "v=DKIM1; k=rsa; p=..." <domain example.com> bounce-domain bounces.example.com # VERP bounces spf-identity mfrom # Use MAIL FROM for SPF </domain> 6.3 IP Restrictions (Inbound Relay) <accepted-connect 127.0.0.1> allow-submission yes require-auth no </accepted-connect> <accepted-connect 10.0.0.0/8> allow-submission yes require-auth yes auth-plain /etc/powermta/passwd </accepted-connect> 7. Logging & Monitoring 7.1 Delivery Log Format log-format-extended "mail.log" "%ts %d %r %s %S %T %p %b %B" # Fields: timestamp, domain, recipient, status, size, time, IP, bounce, message-id 7.2 Bounce Processing bounce-log /var/log/powermta/bounce.log bounce-category-log /var/log/powermta/bounce-category.log permanent-bounce-after 7d # Suppress after 7 days of soft bounces 7.3 HTTP API & SNMP http-mgmt-port 8080 http-mgmt-interface 0.0.0.0 http-mgmt-auth /etc/powermta/htpasswd snmp-port 161 snmp-community public 6.1 DKIM Signing <