> How can I configure my primary server to accept connections/mail from the > secondary server but still refuse connections/mail from all other cable > connections.
I use TLS client certificates for these purposes* http://www.postfix.org/TLS_README.html * Not for backup to primary mx, but whenever I 'own' both sides of the connection and one is behind a dynamic ip (soho server sends outgoing mail via company relay, ...).
