So... - The filtering server should be able to connect without authentication - The filtering server should NOT be able to relay - Everyone else should be required to authenticate
It sounds like the mail from the filtering server will all be destined for your user server, so you should not need any special setup. Courier will accept mail for addresses that it is configured to accept mail for. Just don't put your user server in DNS as an MX, that's easy.
And if you're paranoid about enforcing this, the default configuration files /explicitly/ state that it's possible to do so. Quoted:
# Set AUTH_REQUIRED to 1 in order to force the client to use ESMTP # authentication. You can override AUTH_REQUIRED on a per-IP address basis # using smtpaccess. See makesmtpaccess(8).
So, set AUTH_REQUIRED to 1 in esmtpd and then add a line in smtpaccess/default like so:
192.168.12.12 AUTH_REQUIRED=0
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