How would I configure a firewall server to forward to an internal server over an authenticated submission connection? The examples I'm reading seem to show an unauthenticated connection to port 25. I expect I'd use a custom internal user for this.

Reference: https://www.postfix.org/STANDARD_CONFIGURATION_README.html#firewall

I'm migrating from sendmail to postfix. I've got a hosted server running sendmail receiving email for my domain and am fetching from its local accounts with fetchmail running in a loop on my internal sendmail server. It looks like the postfix firewall configuration would allow me to switch this from a "pull" setup to a "push" setup, eliminating fetchmail and its loop delay from the equation.


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