Leandro Santiago:
> Hi dear folks in the list,
> 
> Dovecot supports the authorization policy server [1], so I wonder if 
> there's any initiative to provide similar support on postfix.

Postfix proxies requests and responses between the remote SMTP
client and the SASL backend, so it cannot do smart things at the
SASL level.

> I wonder how feasible it is to use the server auth policy with
> smtpd_client_restrictions. The protocol is quite simple, http/json
> based.

If you take that route, I suggest that you use the check_policy_service
interface, also at http://www.postfix.org/SMTPD_POLICY_README.html .
There are plenty examples of policy plugins to build from.

        Wietse

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