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<virtual-mta name="mta-tx-1"> <host-name>tx1.yourdomain.com</host-name> <smtp-port>25</smtp-port> </virtual-mta>
<!-- Catch-all for smaller domains --> <domain default> max-msg-rate 200/s max-smtp-out 50 bounce-after 4d retry-after 30m </domain>
<!-- SOURCE DEFINITIONS --> <!-- Who is allowed to send mail through this server? --> <source {127.0.0.1}> always-allow-relay yes process-x-virtual-mta yes smtp-service yes </source>
<powermta> <!-- GENERAL SETTINGS --> <!-- Set the hostname to something that resolves reversely (PTR) --> <host-name>mail.yourdomain.com</host-name> <!-- Run as a background service --> <spool-enabled>yes</spool-enabled> <!-- Safety net: Don't overload the server CPU --> <max-cpu-usage>90</max-cpu-usage> <!-- SMTP LISTENER --> <!-- Listen for incoming mail from your application --> <smtp-listener> <port>25</port> <address>0.0.0.0</address> <max-rate>500/s</max-rate> <!-- Accept mail quickly from local apps --> </smtp-listener>
<!-- Handling the Giants: Yahoo/AOL --> <domain yahoo.com> max-msg-rate 50/s max-smtp-out 10 dkim-sign yes <!-- Yahoo is strict on engagement --> bounce-after 5d </domain>