v3.1 configuration example

Authentication DNS checklist

Review and adapt this example to your topology, product version and security requirements.

[ ] PTR resolves to the SMTP hostname
[ ] SMTP hostname resolves to the same IP
[ ] SPF authorizes every sending source
[ ] DKIM validates with the active selector
[ ] DMARC alignment is confirmed
[ ] Bounce domain and Return-Path are operational

Important: replace example addresses, credentials, hostnames and paths. Validate syntax before deployment.