In modern email delivery, unauthenticated mail is usually junked or rejected. PowerMTA provides native support for signing outgoing messages. Native DKIM Signing
Disclaimer: All IP addresses in this guide ( 203.0.113.x ) are reserved for documentation (RFC 5737). Always test configs with pmta checkconfig before restarting. powermta configuration guide top
Implement authentication mechanisms to prevent spam and ensure secure email delivery: In modern email delivery, unauthenticated mail is usually