Kai Krakow:
> >>     smtpd_client_event_limit_exceptions = dnsxl:xbl.spamhaus.org
> > 
> > Except that this does not block AUTH commands. Currently all that
> > smtpd_client_event_limit_exceptions does is not announce AUTH support
> > in the EHLO response.
> 
> Hey thanks, I love the potential of this. But how could I block AUTH 
> altogether then? Because that way postfix could be made stop disclosing 
> information about wrong or false credentials to unwanted clients.

Currently, you can turn off the AUTH announcement only.

> BTW: Why does smtpd_client_event_limit_exceptions stop announcing AUTH 
> commands? From the docs I would never understand that it acts this way:

Sorry, that should have been smtpd_sasl_exceptions_networks.

        Wietse

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